Contagious Cassandra Truth

Vice-President Roger Durling: You have to step back from this for a moment. Take a deep breath, walk around the room-think. There is no reason to expect the Russians did this. Now I talked to the CIA, and they said—
President Bob Fowler: Ryan, you mean.
Durling: Yes, he just filled me in, and—
Fowler: Ryan's been lying to me.
Durling: Bullshit, Bob. He's too much of a pro for that.
Fowler: Roger, I know you mean well, but I don't have time for psychoanalysis.

— The Sum of All Fears

When a hero delivers a Cassandra Truth, they usually have trouble convincing anyone to believe them. Sometimes they get lucky though; maybe they're speaking to a Reasonable Authority Figure who hears them out and decides to investigate further or perhaps irrefutable proof of Demonic Alien Ghosts just burst through the wall. Either way, somebody you expect to have more influence than you is convinced that you're right... but they're no more able to convince anybody else than you.

Maybe the Police Are Useless for everyone, perhaps the person you've convinced can't convince their bosses, or it might just be that your new confidant already has a reputation for believing crazy things. Par for the course if an Extra-Strength Masquerade is involved. Bonus points if a scene where they try to convince someone to believe them parallels one they had with the heroes. Either way, they've put their name on the line but ended up co-signing your discredit card.

Compare and contrast the Secret-Keeper, who learns the truth but agrees to keep it to themselves, and Broken Masquerade. A Rogue Juror is often dealing with this trope but may also be believing a lie or agreeing with an non-Cassandra Truth argument.

Examples:

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Anime and Manga

Monster (1994): Over the course of the series, various people grow convinced that Dr. Tenma is telling the truth about Johan committing the murders that he is accused of and/or are persuaded to work toward exonerating him upon realizing that he is a good person and does not deserve to be a fugitive, up to and including Inspector Lunge. However, they still remain largely powerless to prevent the authorities from attempting to apprehend Tenma, save for trying to take matters into their own hands.
SPY×FAMILY: The Whole Episode Flashback revealing Twilight's past and how he became a spy actually reveals that Franky Franklin was the one to instigate it through this trope. Franky realized that the government can just feed masses the information they want them to have and even manipulate them, so they'd rally behind the war between Ostania and Westalis. With both sides claiming the other was the instigator of the war, Franky decided that fighting without knowing the full picture was simply a dumb idea and deserted from the army. Twilight ignored and denied this at first, but after his childhoodfriends were sent on what basically amounted to a suicide mission and wondering if having more intel about the whole thing could have saved lives, Twilight leaves the army to join the intelligence divison.

Comic Books

Superman:
- In the The Superman Adventures continuity, Jor-El does convince enough Science Council members to at least consider the danger of their planet exploding for them to argue about it at a dinner and alarm Paula, the daughter of some of the councilors who disagreed with them, enough to make her confide her worries to her friend Kara (who convinces her It's Probably Nothing).
- In Last Daughter of Krypton, Zor-El becomes convinced that his brother Jor-El is right and Krypton is about to blow up. However, he knows he will not be more successful than his sibling in reasoning with the Science Council who rule the planet, so he secretly builds a rocketship in a secluded lab, shoves her daughter Kara into it, and blasts her into space right before their planet explodes.

Fan Works

Coming Home: At first, Frank dismisses James' belief that something is out to get him as mere paranoia brought on by grief over the recent loss of his wife. When he finds out the truth, however, he desperately tries to get help... only to find that nobody believes him.
Compulsion (Lead Zeppelin): The only one who believes Alex about the threat that Leet's escaped chimeras pose, as well as his concerns about the chimeras reproducing, is Director Piggot. Unfortunately, Leet is widely considered to be a joke, along with everything he creates, so others refuse to accept that he might have made something incredibly dangerous.
A common plotline for Miraculous Ladybug fics is Marinette struggling to convince others that Lila is a Manipulative Bitch who keeps lying to them. Often, especially in Salt Fics, the only people who believe her are other characters whom the author likes, who find themselves facing the same problem as Marinette: no matter what they say or do, nobody is willing to believe them.
- Played for Drama in the Feralnette AU; One of the reasons why Marinette Stopped Caring about trying to salvage her social life is because she grew accustomed to nobody being willing to believe her about Lila, be they adults or her peers. While New Transfer Student Felix becomes a much-needed ally, he soon finds that nobody is willing to believe him about Lila, either. This gets highlighted especially well in Birds of a Feather; despite him, Marinette and Kagami asking Rose not to reveal the existence of his ballet troupe, stressing how the fact Lila acts nice around her doesn't mean she treats others well, she still starts composing a message to the Bitch in Sheep's Clothing the moment the other girls turn to leave:
  Felix: What are you still doing here, and what are you texting, Rose.
  Rose: O-oh, I'm... I'm about to, uh...
  Felix: You're texting Lila.
  Rose: Well I-! I don't want to let her down!
  Felix: So it's okay to let down Marinette? Even when she asked you to restrain herself?
- the high road plays with this by combining it with Hourglass Plot: After Adrien, Alya and the rest repeatedly reject Marinette's efforts to warn them about Lila, she decides to give them exactly what they want by pretending to be taken in by her lies... and catering to her every whim in ways that force the rest of the class to participate in the lopsided dynamic as well. This motivates them to look into Lila's claims and realize the truth, only for Marinette to feign obliviousness and pretend she doesn't believe them, giving them A Taste of Their Own Medicine.
- Played With in The Karma of Lies: Adrien knows that Lila's a Con Artist, but assumes that knowledge means he's safe — and since HE won't fall for any of her lies, he's perfectly fine standing by letting her string all his classmates along. The moment he realizes that she's tricked HIM as well, he immediately blurts out that she robbed him, only for Alya to promptly chide him that "We all know Lila doesn't lie!" His efforts to convince the police fall flat as well, and having the rest of the class gradually come to believe him once they realize they were tricked doesn't help, especially when they discover how he'd refused to warn them.
- The One to Make It Stay: After Rose asks Prince Ali about Lila, she learns that she lied about doing charity work with him, as he'd never even heard of her before. This leads to all of Kitty Section — Rose, Juleka, Ivan, Mylene and Luka — learning about her true nature. Yet when they attempt to warn the rest of the class, they aren't entirely convinced. Alya even blatantly moves the goalposts by declaring that all their evidence only proves Lila fibbed about one thing, refusing to accept any evidence that her other claims are just as phony.

Film — Animated

Chicken Little (2005): After the title character finally succeeds in convincing his friends that "the sky is falling" (in other words, an alien ship was visiting), when they try to back him up, the rest of the town doesn't believe them either.
Doug's 1st Movie: Doug and Skeeter tell the Mayor about the swamp creature they found, but she can't publicly declare its existence without backlash. They try, but an attempt to capture the beast by a Corrupt Corporate Executive impedes this.
Predator: Killer of Killers: While Torres is initially confused by a wounded pilot's story about the mysterious Predator ship he barely survived fighting, after that man manages to crash land on the carrier despite his missing engine, Torres is concerned enough to examine the wrecked plane and find an alien grappling hook stuck in the metal. He then finds himself struggling to convince the Texas Aces of the Predator's threat once he flies after them until they've been whittled down to two that the remaining pilot listens to him.
Recess: School's Out: TJ witnesses suspicious activity at the school and tells his parents and the police, only for them to laugh him off. TJ then gets the school principal... who is seemingly disintegrated when he tries entering the building to prove that TJ is being ridiculous. At which point he travels to all his friends respective summer camps to drag them to the school, only for them to think he's lying due to the lack of proof when they get there. At least until they all witness a giant satellite dish emerge from the school roof. Later on in the movie, when TJ gets captured by the organization using the school as a secret base, TJ's friends report the incident to the cops only to be laughed at as well. One of the teachers gets the same treatment when she comes by to back up the story.

Film — Live-Action

12 Monkeys has an interesting variation of this trope. Dr. Railly doesn't believe James Cole's claims that he's from the future, but when he disappears, she investigates his claims and finds corroborating evidence. When Cole returns, Dr. Railly has difficulty convincing Cole of the truth, as he has accepted her explanation that he is delusional. Ultimately, they are both on the same page, but can convince no one else as they race to save the future from The End of the World as We Know It, while being chased as hunted fugitives and suspected terrorists. But none of that matters, as it turns out that You Cannot Change The Future and the film ends on the virtual definition of a Downer Ending.
Avalanche Sharks features quite a bit of this. Old Duffy is widely dismissed as a crazy old hermit by the local sheriff, ski patrol people and spring-breakers when he shouts out warnings about sharks in the snow. Then the sheriff is convinced the sharks are real by his wife, and some of the spring-breakers find evidence of attacks while looking for the brother of one and the cousin of another. None of them are given much credence by the local mayor, ski patrol man and resort owner. The spring-breakers try to warn some of their friends on the mountain right before another attack, with only one girl listening to them and leaving in time, while even the ski patrol guy finally starts believing after seeing an attack, but its difficult getting the lift operator to start sending people down right before the Characters Dropping Like Flies climax.
Beverly Hills Cop: Axel F: When Jane and Billy claim that their client was framed for murder, Detective Grant is openly skeptical. After subsequent developments convince him otherwise, he still fails to convince Chief Taggart.
In Breakin, the main character manages to get her extremely skeptical agent to come down and watch a street dancing contest. This convinces him that they have potential and he agrees to take on her friends as clients too. Unfortunately he has even more trouble convincing his contacts to take them seriously.
In the Child's Play series, Mrs. Barclay ends up being committed because the cops who witnessed Chucky refused to back up her story.
In Edge of Tomorrow, after William Cage dies several times after fighting the Mimics in a doomed frontal assault, he tries to warn his squad-mates that the counter attack was going to fail, and the Mimics would take over Earth, but they tape his mouth shut shortly before they go off to battle and die. He then joins Rita Vrataski, who had gone through the same thing some time earlier and who has secretly partnered up with the foremost expert on the Mimics. When Cage asks her that if they know about the Mimics ability to manipulate time to their advantage, why they don't take that information to the high command so they can formulate a battle plan, Rita answers that she tried numerous times, and for her trouble she was either put in a psychiatric hospital, or was dissected to see if anything could be learned from her physiology. As for the researcher, he says when he tried telling them everything he learned about the Mimics, and that he had invented a device that could track down their leader via their Hive Mind mentality, he was labeled a crackpot, and dismissed. Cage tries to relay their findings and it takes many loops before he makes the General even remotely willing to consider what they are saying.
Final Destination Bloodlines: Stefani goes from backing away from a You Have to Believe Me! Grandma Iris to getting similar reactions from most of their family when she first tries to convince them Iris was right about their curse after seeing it kill Iris.
The Fugitive: By the final act Gerard and his Marshal team start considering Dr. Kimball may be honest in claiming not to have killed his wife, but the local cops brush off anything they say to this effect.
In Happy Accidents, Ruby starts wondering whether Sam is telling the truth.
In Harry Potter and the Prisoner of Azkaban, when Harry and Hermione try to tell Dumbledore that Sirius Black is innocent, he is quick to believe them (he may have even suspected it since he went to prison), but acknowledges that even his word added to theirs won't be enough to convince many people.
In the Shadow of the Moon: By the time Tom starts believing a scientist about the killer being a time traveler, he has lost too much credibility for anyone to hear him out, especially since the scientist himself has now realized the time traveler’s killings are Dirty Business that need to get done and gone into hiding.
Sabretooth: Everyone else is skeptical of Lola insisting she saw a gigantic and hostile cat until they find some big tracks that convince Casey they should leave, but Trent and Leon still take a while to get worried about it.
In the middle of The Terminator, Sarah Connor seems happy to accept the psychologist's explanation that Kyle Reese is a paranoid schizophrenic, and the Killer Robot is just on PCP. By the beginning of the second film, she's locked up in a mental asylum for insisting that Reese's story about the impending apocalypse is true.
- Some Deleted Scenes from the first film showed LAPD Detective Traxler gradually believing Kyle's allegations about the Terminator. In one scene, his fellow detective Vukovich asks "You think he's crazy?", to which Traxler simply says "He better be.". And an extended take for his death scene had Sarah and Kyle discovering him, admitting that Kyle was right all along, and he lets him take his pistol, saying "do whatever you have to do" to protect her.

Literature

In 1636: The Viennese Waltz: When Prince Leopold tells another guest and a guard there is a bomb in the basement of a royal wedding venue, they wonder if he might be drunk until they do find the bomb. The guard races upstairs to tell everyone to evacuate and is promptly accused of taking a bribe from Leopold (the bride once kicked him in the crotch when he made an unwelcome pass on her) to disrupt the wedding.
Goosebumps: Discussed in Say Cheese and Die — Again! When Mr. Saur refuses to believe Greg's story, he insists that his friends can corroborate, only for Mr. Saur to dismissively declare that he's sure they'll tell him whatever Greg wants them to say. Greg later lets his friends know that their testimony won't matter to the adults.
The Lost World (1912): Nobody believes Professor Challenger's claims that he's found Living Dinosaurs on a remote Amazon plateau. Summerlee even joins one of his expeditions with the intent of proving to Challenger that he's nothing but a charlatan and a fraud, only to end up in the same predicament as him, with nobody believing their stories.
Serge Storms: Data miner Benmont gets into this twice in No Sunscreen for the Dead:
- First, when he begins to suspect a client is using his reports to track down and murder people with phony Social Security numbers, he tells his boss Quint, who has a hard time accepting it but then forwards the report to a friend in the Social Security bureaucracy. That friend initially dismisses the report but then turns it in to his boss, just in case, only for his boss to disregard it.
- After it comes out that the murders are related to a spy ring and the spies kill Quint and the company lawyer (the only people who knows that Benmont was the initial whistle-blower), Benmont finds himself being accused of treason, espionage, and murder. His coworker Sonic knows better and convinces an FBI investigator named Carlson of Benmont's innocence, but Carlson is unable to convince anyone else in the task force.
The Sum of All Fears: Once Ryan gets Vice-President Durling to hear his evidence why he thinks a False Flag Operation started the war, neither of them can get this through to President Fowler for a while.
Watership Down: Though still largely unbelieved by the warren’s leadership, Fiver, our Cassandra archetype, is able to convince a small group of other rabbits, including his brother Hazel, to leave their warren before the destruction he foresaw comes for them all.

Live-Action TV

This is the whole subplot in the second season of Squid Game. After Seong Gi-hun survived the first season he finds himself hunting the ones who started the games and end up getting the help of Hwang Jun-ho who is a cop that snuck into the games, and Choi Woo-seok a gang member who witnessed a co worker get killed from the games. But despite this help he hasn’t gotten much help from anyone outside of the people he hired.
In Angel's "Shiny Happy People", Fred catches Cassandra Truth literally from Jasmine's blood, and then figuratively when she talks to the only other person so far to see the truth (who had been converted earlier), who explains to her "she [Jasmine] must die" and "you've been called".
On First Wave, Cade starts off on his own knowing of an alien invasion of Earth. He eventually manages to convince paranoid conspiracy nut "Crazy" Eddie who likewise joins him in fighting the aliens.
- There are bits in the series where someone else realizes what's happening and aids Cade. At one point, they're able to put together a small network of agents secretly working against the aliens until they're wiped out in a purge.
Throughout the second season of Hannibal, Will gradually manages to convince several other characters of Hannibal's true nature. None of this actually helps Will, as these potential allies proceed to either skip town or get disposed of. One finds themselves the victim of a Frame-Up that Hannibal had been planning for two years.
Monk: In one season one episode, Benny sees a murder and his mother is skeptical but Mr. Monk believes him, when they tell the hotel staff, the chief of security is open-minded but can’t convince the skeptical manager to alert the authorities or give them more than a limited window to look for the body he doubts they will find.
Motherland: Fort Salem: When Tally realizes that the Spree are disguising innocent civilians in a bomb-equipped Spree truck, she warns Anacostia, who believes her, but is ordered by Alder to kill them all anyway. When Tally tells Abigail and Raelle this later, they also instantly believe her.
Mulder usually had this problem after convincing Scully about his theories on The X-Files. Other characters they convinced also tended to suffer this trope (if they weren't blackmailed or bribed by the Ancient Conspiracy).

Video Games

Dragon Quest VII: After the heroes prevent a tragedy from unfolding in Vogograd, the prefect promises to memorialize the events so that they learn from their past... but in the present day, said memorial has been replaced with a version of events that makes the party out to be the villains of the tale. Only one young boy, Lev, recalls the real story, which leads to him being completely isolated and picked on by the other kids... until they find the original monolith. The adults refuse to accept the truth, punishing their children for adopting the real version of events; however, the kids remain resolved to keep the truth alive.
In Mass Effect 3, Cowboy Cop Garrus Vakarian details to Commander Shepard how he successfully convinced his usually skeptical By-the-Book Cop father (that he was a bit estranged with) that the Reapers are real. Since his father has connections in the top echelons of the Turian Hierarchy, he tries to convince the Primarch. The Primarch is... less convinced. Averted once the Reapers finally arrive; Garrus's dire portents are vindicated and he gets catapulted to the top echelons himself and has generals saluting him.

Western Animation

In the Invader Zim episode "Vindicated", Dib thinks he's managed to convince the school's guidance counselor, Mr. Dwicky, that Zim is an alien who's trying to conquer Earth, but Dwicky tells a colleague that he's just playing along so Dib will eventually feel comfortable enough around him to confess what always has him so on edge and antisocial. Dib feels very hurt once he realizes that Dwicky never really believed him, but then Zim shows up without his disguise because he fell for the trap Dib and Dwicky set up, pretending to be fellow aliens offering him superweapons. Then the aliens Dib and Dwicky pretended to be show up too, and they just so happen to have superweapons in tow. Dwicky quickly has his childhood belief in aliens reignited, and accepts the offer from the other aliens to let him travel the stars with them... taking with him the video evidence that Dib needed of Zim's alien identity.
Jackie Chan Adventures:
- At the end of the first season, after spending the past dozen episodes reprimanding Jackie whenever he brings up magic), Captain Black finally witnesses magic firsthand when the season's Big Bad returns to full strength in front of him. During the midseason finale of season two, Black tries to debrief his superiors on all the details regarding the Dark Hand so far when the plot escalates once more, only to have the government immediately reassign all matters regarding the criminal organization to another bureau. This doesn't stop Sector 13 from continuing to deal with the gang, mind you, as they have the excuse that they have greater proximity to the group than any other branch (they're in the exact same city), but Black becomes careful to treat all magical phenomena as off-the-book missions from then on. There are still situations where he is forced to try (and fail) to explain things like why it's so important for a random collection of stones to be kept in a high-security vault, though.
- It's occasionally shown that Jade loves to share stories about her supernatural adventures with her classmates and teachers, who brush them off as ridiculous tall tales birthed from an overactive imagination. One of her peers, a boy named Drew, is especially mean about ridiculing Jade's claims. In the season three episode "Animal Crackers'', Jade caves to his most recent jab and brings some magical animals to a school fair, resulting in Drew witnessing their abilities when the villains try to kidnap them. At the end of the episode, as Jade attempts to come with a plausible excuse for the day's events — the only thing anyone else could surmise from the chaos is that some zoo animals escaped their enclosure — Drew cuts in and tries to tell the truth, prompting Jade to snark that she thought she was the one with the wild imagination when no one believes him.
Phineas and Ferb
- One episode has Candace finally convince her mom that her brothers have done something bad, only for her in turn to have trouble convincing her husband. When Candace points this out to her, however, Linda fails to realize it.
- In another episode, Stacy and Jenny join Candace in busting Phineas and Ferb, but when they try to tell their mom, she merely thinks that Candace is rubbing off on them.
In The Simpsons, one episode has Lisa discover that town founder Jebediah Springfield was secretly a villainous pirate. No one believes her story except Homer, who is savvy enough to know Lisa is usually right in situations like this. They fail to convince anyone else and Homer is stripped of his role in the town parade as punishment. Subverted when it is revealed that the museum curator learned this information years earlier and has been covering it up ever since. He relents to Lisa's desire to tell the truth, but Lisa comes to agree with his original viewpoint that it's best to keep the fake backstory intact as a Motivational Lie once they get to the town parade.
In the TaleSpin episode "It Came from Beneath the Sea Duck", Kit is chewed out by Rebecca for taking Molly outside the apartment while babysitting (in reality this was for a load of convoluted reasons). Baloo is smart enough to suggest letting Kit explain what happened, however Rebecca just assumes that Kit learned his irresponsible behaviour from him and shushes him too.

Contagious Cassandra Truth
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Examples:

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Contagious Cassandra Truth 5 Following

Examples:

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Gabe's Closet

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Gabe's Closet

Contagious Cassandra Truth
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