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Shared Mass Hallucination

 Shared Mass Hallucination
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Shared Mass Hallucination
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SharedMassHallucination
 Shared Mass Hallucination
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"Explanation" cooked up by unbelievers whenever something that contradicts the Masquerade is very, very public.
Hallucinations don't work that way — even if multiple people were exposed to the same hallucinogen, they wouldn't see the same thing. The only time it's remotely plausible is if the people were already expecting to see whatever it was they believed they saw (which, in fact, is a very large part of how Stage Magic is performed) — and even then, they probably wouldn't share the particular details of the hallucination.
It's up there on the Stupid Explanations Chart with "it was a weather balloon" except that it's said with a straight face. See also Gas Leak Cover-Up.
Note that mass hallucination and mass hysteria are two different things.
Explained in a lot of cases by people simply not wanting to believe in things like hostile aliens or demons from Hell coming to Earth. The stupid explanation works because people are willing to ignore the reasons a shared hallucination isn't actually possible if it means they can keep believing they didn't really see an army of demons last week.
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The ending of Contact has the folks on Earth writing off the experience of the protagonists as one big Mind Screw. In the film, there is only a single person sent through the machine, so it's written off as either a hallucination or something she made up.
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In the Angel: After The Fall comics, after the Senior Partners break the masquerade by sending the whole city of Los Angeles to hell and then undo it, everyone still remembers it, but most of the muggles convince themselves that it was actually a shared mass hallucination. And someone makes a Hollywood film out of, so everyone outside of LA thinks it's fiction.
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In the Looney Tunes short "Punch Trunk" people are thrown into a panic at sightings of a six-inch-tall elephant. An expert comes on television to dismiss it as a mass hallucination caused by the stress of modern life - only to be undercut by the elephant wandering into the studio.
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In the old X-Factor comic, they blamed Inferno (1988) on mass hallucinations caused by A.I.M. satellites. At least it's plausible given the weird tech that villain groups have.
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In one arc of Full Frontal Nerdity the geeks caught a bad flu that causes them to see themselves as the supporting cast of The Wizard of Oz, one wonders what actually happened when Nelson set Lewis on fire to use as an AOE weapon against the flying monkeys.
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In The Dresden Files book Dead Beat witnesses to the climax involving Harry reanimating a zombie T-rex and riding it into battle through the streets of Chicago apparently let themselves be convinced that it was an example of this trope caused by a hallucinogenic reaction to the spores from a batch of mouldy bread. Harry is fully aware how ridiculous this explanation is, but chalks it up to another case of humans swallowing anything rather than face up to the implications of what they've seen. To be fair, though, this particular incident is so ridiculous that even people who might normally be open to the idea of the supernatural would probably find the bread explanation less absurd.
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In Chaos;Head, This is how Gigalomaniacs and in turn, Noah II alter reality. By controlling antiparticles through their DI-Swords to appear within a person's "dead spots", they can make their delusions appear and interact with their five senses, making it indistinguishable from reality. This range from making a soft flowerbed appear out of hard paved floor to creating an entire living, breathing person (like the player character himself), and to those affected it can feel like they've always been there.
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Shared Mass Hallucination
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In a Haruhi Suzumiya short story, Snow Mountain Syndrome, the plot of the entire story (almost a day long) was explained to Haruhi as shared Highway Hypnosis. From wandering in a blizzard.
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A minor version in The Beast from 20,000 Fathoms, where the hero, Dr. Nesbitt, lost in an Arctic wasteland, finds his colleague, George, raving about seeing a monster. Soon afterward, Nesbitt sees the monster himself, but George freezes to death. When he gets back to base, Nesbitt is told by his superiors that the cold can cause hallucinations, but since George saw the exact same thing, Nesbitt is not convinced.
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The Master and Margarita, everything the Devil did is later explained as hypnosis, mass hypnosis, or, in one case, long distance hypnosis.
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At the end of Professor Layton and the Diabolical Box, is revealed that the bright and lively appearance of Folsense is a hallucination provoked by some sort of hallucinogenic gas rising from the town's mines, with everyone seeing the same buildings and decorations despite most of them being destroyed or in state of decay. This is also the reason why everyone believes Anthony is a vampire including himself, as the hallucionation makes him look eternally young when in fact he's a fragile old man.
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Ghostbusters:
EPA official Walter Peck's explanation for the ghosts in Ghostbusters:
A newsreader in the 2016 remake asks the mayor if he's going to say that the ghosts are actually hallucinations caused by terrorists poisoning the water supply.
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Graveyard School namedrops this in one book, then immediately has it subverted. It's never made quite clear how The Masquerade remained intact after a supposedly hallucinated dinosaur ate a teacher.
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Good Omens (2019): After the events of the show, the governments of the world pass them off as being this, even when said "hallucination" ate one's trade delegation.
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It seems to be implied in Doctor Who that it isn't so much a case of outright disbelief so much as humans responding to the threat of something very scary and out of their control with the rather useless tactic of pretending it didn't happen. Evidence that this is the case was provided in the 2007 Christmas episode, where the Doctor found London to be almost completely deserted due to the usual inhabitants having realized that Christmas in London equals dangerous weird stuff, and cleared off.
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The Men in Black do this after using their neuralyzers, wipe the targets' short-term memory and make them extremely susceptible to suggestions, allowing the Men in Black to craft a plausible suggestion that everybody "saw." And since it's the targets' own brains that create false memories to fill in the blanks of whatever basic explanation the MiB provide, the usual flaw in this trope doesn't apply: each person's brain will come up with something a little different, and thus the inconsistent details from one person to the next actually make the Masquerade more believable.
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In CSI, Grissom refers to the alien conspiracy theorist club as having a shared mass hallucination. Of course, they saw this as a part of the evil police force working for the reptilians trying to put them down.
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EPA official Walter Peck's explanation for the ghosts in Ghostbusters:
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A newsreader in the 2016 remake asks the mayor if he's going to say that the ghosts are actually hallucinations caused by terrorists poisoning the water supply.
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A weird case from an episode of South Park — when both Kenny and Gerald "cheese" (a way of getting high by having a cat spray in your face), they both enter the exact same fantasy world, inspired by Heavy Metal.
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In the Astro City story arc "The Dark Age", there is a brief mention of a battle with the L.S.Deviant, an alien that induced reality-warping hallucinations throughout the city — cars eating pedestrians, buildings breathing, people sprouting wings...
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The mages of Negima! Magister Negi Magi use something like this maintain their Masquerade. A villain attempting to reveal said Masquerade used just the opposite: remove people's logical reaction to disbelieve the mystic, then spread over the planet to make sure no skeptic is left unbelieving (magically powered suggestion on a massive scale).
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The Case for Christ: Lee brings this up as a possible explanation of the Resurrection, but this is debunked by an agnostic psychology professor.
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In So Long, and Thanks for All the Fish, soon after Arthur Dent lands to his shock on Earth, he is told that the Vogons' apparent destruction of the planet (the very premise of the series) was a CIA-induced mass hallucination. In fact, Dent has landed on an Earth rebuilt by the dolphins.
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Amphibia has this occur in the episode Stakeout after Anne and Hop-Pop share each other's coffee-esque drinks and have a biochemical reaction. Pure Rule of Funny as to them seeing the exact same trippy things as the other.
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The Russian government uses this excuse in Mobile Fighter G Gundam to ignore the Devil Gundam in favor of pursuing victory in the Fight, much to Nastasha's irritation—Argo was infected by it and she herself was nearly absorbed.
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A Pokémon: The Original Series episode had the police attributing reports of an Aerodactyl attack to mass dreams. Slightly more reasonable than some examples, since Pokémon with Psychic Powers that can subject victims into the same dreamland are a well-established part of the setting.
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In Arkham Asylum: Living Hell, Batman explains away the presence of demons and Hell on Earth by telling the Asylum staff that it was due to Scarecrow's fear gas. Jeremiah Arkham accepts the explanation and sends Crane to solitary confinement, much to Crane's bewilderment.
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The following is a list of statements referring to the current page from other pages.

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The Secret Index
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