A character swallows a key for safekeeping, whether to lock something or someone inside a device or room.

See also StomachOfHolding. Compare TreasureChestCavity.
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!!Examples:

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[[folder:{{Anime}} and {{Manga}}]]
* A character in the ''Manga/YuGiOh'' manga does this as part of his hereditary Human Vault job. It's one of the many NightmareFuel moments if you think about how he'd have been prepared for the role.
** Mokuba does this as well, hence his Duelist Kingdom kidnapping in the manga (in the anime, he hides the key in his locket instead).
* One of Jackal's men in ''Manga/FistOfTheNorthStar'' does this in an attempt to keep Jackal from releasing the Devil's Rebirth from his cell. It doesn't work out that well though, as Jackal rips him open to get it back.
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[[folder:ComicBooks]]
* JudgeDredd did this in the comic where he fought the devil.
* ''ComicBook/YTheLastMan'': Yorick does this trick as he is a trained escape artist, and he's taught it to his sister Hero, who uses a regurgitated key to escape prison.
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[[folder:Films -- Animated]]
* Done in the ''WesternAnimation/{{Coraline}}'' movie by the Other Mother.
* In ''WesternAnimation/PussInBoots'', Jack swallows the key that locks the box where the magic beans are kept.
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[[folder:Films -- Live-Action]]
* The forgettable ''Film/BioDome'' had one of the {{Idiot Hero}}es swallow the key to the titular biodome to keep the project going.
* Apparently ''forced'' on one of Jigsaw's captives in the original ''Film/{{Saw}}'', so that another prisoner could be required to cut it out of his body to stop her own rapidly-approaching demise. [[spoiler: No, contrary to what she'd been told, the key-swallower was ''not'' dead when she started cutting.]]
** Done again in the final movie. The protagonist must free a woman from her trap, with the key in her stomach attached to fishing line coming out of her mouth, with fishhook included, so he had to be very careful when pulling it out or else the hook would tear her apart from the inside.
* In ''Film/CubeZero'', Dodd tears out a power coupling to prevent the villains from killing his colleague Wynn and swallows it when their leader Jax confronts him over this. [[spoiler:Subverted, as Jax simply paralyzes Dodd and personally cuts it out of him.]]
* ''Film/EasyStreet'': When The Bully has the The Tramp trapped in his apartment, he locks the door and swallows the key so The Tramp can't escape.
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[[folder:{{Literature}}]]
* In ''WorldWar'', due to the Lizards not understanding English expressions too well, they threaten to throw Rance into prison and "eat the key".
* In ''Joey Pigza Swallowed the Key'', this is done by the titular character entirely by accident: he suffers from ADHD and develops a habit of putting the key in his mouth and then using the string attached to it to pull it back out just before he swallows it. When his exasperated teacher removes the key from its string to discourage this, he still unthinkingly puts the key in his mouth and since there's no string to retrieve it this time...
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[[folder:LiveActionTV]]
* On an episode of ''TalesFromTheCrypt'' ("Carrion Death"), a criminal and a cop are handcuffed together. The cop is killed, but he manages to swallow the key before the criminal can get it, forcing the criminal to lug the dead cop along as he attempts to escape across the desert.
* In ''{{Jekyll}}'', there's a scene where Claire swallows the key keeping Hyde locked up. (In this case, it turns out she didn't actually go through with the swallowing, and the key stayed hidden in her mouth.)
* In the ''{{CSI}}'' episode "Abra-Cadaver," the killer, a StageMagician who was perfectly willing to kill his family members for the sake of illusions, does this at the end (although Grissom did think to [[GenreSavvy check his mouth]]). Foreshadowed by a mention of the Harry Houdini example below.
* ''TheSuiteLifeOnDeck'': In one episode Mr. Blanket, the school's insane Guidance Counselor, handcuffs Moseby and Zack together and swallows the key.
* The televised ''{{Zorro}}'' with Duncan Regehr twisted this -- at the end of one episode, he chained up the alcade in the town square and forced the alcade to swallow the key.
* Played with in ''TheMightyBoosh'': in the episode "Jungle", Bob Fossil eats a key, slowly biting bits off it and chewing them.
* Not done intentionally, but El Blanco the Graboid ate a gangster in an early episode of ''{{Tremors}}: The Series'', who happened to have the key to a mob safety-deposit box around his neck at the time. In a later episode, the gangster's surviving associate returns to try to kill El Blanco and retrieve the key, hoping to empty the deposit box of its millions.
* Done accidentally in ''{{Coupling}}'', when Jeff Murdock holds the key to his girlfriend's handcuffs in his mouth and then does his best Darth Vader impression. He spends the episode trying to find a way to get it out before she realizes what's gone wrong.
-->'''Jeff:''' (''on laxatives'') If I take all of them at once, [[{{Cloudcuckoolander}} do you think there's a danger of liftoff?]]
* ''Series/ArrestedDevelopment'': GOB tries to do this in the episode "[[Recap/ArrestedDevelopmentS1E4KeyDecisions "Key Decisions"]] to aid his escape from prison, but first has trouble swallowing the key and later is unable to pass it because of a ShyBladder.
* In one episode of ''Series/MysteryScienceTheater3000'', Pearl, Brain Guy, and Bobo are all trapped in a dungeon in ancient Rome. Bobo has the idea to regurgitate a key to undo their shackles, and Pearl compliments him for his ingenuity in lifting a key off a guard and swallowing it. Turns out Bobo didn't do that; he just thinks there's one in there because he swallows stuff all the time. It works, kind of -- he found a hairpin after a while.
* ''Series/{{Angel}}'': an ex-champion turned DeathSeeker does this to ensure a demon will kill him to get it back; he's actually hidden it in a thermos of coffee, so the demon won't get what he wants.
* In Disney's ''ShakeItUp'' episode Show It Up, Flynn helps Deuce prepare for the talent show by suggesting he perform magic. During one trick, Deuce is chained to a chair and was supposed to have held the key in his mouth rather than swallow it.
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[[folder:{{Music}}]]
* "Gatekeeper" by WithinTemptation. Now that this guy [[TheUndead has no metabolism to speak of]] and he's inside with the rest of them, [[SealedEvilInACan well]]...
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[[folder:{{Toys}}]]
* King Smudge, from Fisher Price's Great Adventures Castle, does this in order to prevent anyone from freeing his brother, [[SealedGoodInACan King [=McBeard=]]].
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[[folder:VideoGames]]
* In ''[[VideoGame/LastHalfOfDarkness Shadows of the Servants]]'', the doctor swallowed the key to a strongbox before she died. [[spoiler: You can't open the box containing the ashes from her cremation, but can put it in the fireplace so everything ''except'' the key will be destroyed.]]
* One of Papa Morté's goons in ''{{Shadowman}}: 2econd Coming'' swallows the key to the Wild at Heart to keep Mike confined in the bar for what they hoped would be an easy hit job. Too bad for them, Mike quickly dispatches all the goons and simply retrieves the key from their splattered remains.
* ''VideoGame/ProfessorLaytonVsAceAttorney'': Dzibilchaltunchunchucmil does this in guarding the Bell Tower, which causes some problems in retrieving the key to unlock the door.
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[[folder:WesternAnimation]]
* In one ''WesternAnimation/TomAndJerry'' cartoon where they were doing their take on ''RobinHood'', Tom swallowed the key that went to Robin's cell.
* ''WesternAnimation/StormHawks'': Stork tries to keep the Raptors from getting their hands on a Graviton Crystal by swallowing it.
* On the ''WesternAnimation/LooneyTunes'' short "Fin n' Catty", a cat corners a fish inside a shower, so he locks the door and swallows the key. Only then does the cat realize the shower stall is filled with water ([[CatsHateWater which cats hate]], as everyone knows) and he tries to punch the key out of his stomach.
* In the DonaldDuck cartoon "Trick or Treat", Don locks away all his Halloween candy and swallows the key. A witch then casts a spell on Donald's feet so that they kick out the key.
* The Professor in ''{{Futurama}}'' did this with the spaceship keys to stop anyone from wasting fuel, only to "recover" them the next day.
* In the WesternAnimation/LooneyTunes short "Hyde and Tweet", Sylvester did this after finally capturing Tweety. Only after Tweety's transformation does Sylvester realize that he's trapped.
* In an early episode of ''WesternAnimation/EdEddNEddy'', Double D instructs Ed to hide the key. The guy slips the key between two slices of bread and ''eats it as a sandwich''. ''Chewing and all''.
* ''TazMania'': Taz does this after he has cornered Francis X. Bushlad (who is disguised as an attractive female Tasmanian devil) in "A Young Taz's Fancy".
* ''WesternAnimation/TheSimpsons'': In "On a Clear Day I Can't See My Sister", the manager of the Sprawl Mart locks his employees inside the store, and then taunts them by swallowing the bathroom key.
* In ''Mickey and the Beanstalk'' segment of ''Disney/FunAndFancyFree'', the giant attempts to swallow the key when locking Goofy and Donald in a chest, but decides to put it in his pocket which Mickey soon retrieves.
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[[folder:RealLife]]
* Harry Houdini was reputed to do this with a handcuff-key in preparation for his escape act, then regurgitate the key when needed.
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