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->'''Don Harvey:''' So, hanging on to this switch prevents the bomb from going off, correct?\\
'''Capt. Rhodes:''' Correct. Are you sure you're up to it?\\
'''Don Harvey:''' I'll remember to hang on tight, sir.\\
'''Capt. Rhodes:''' I'm not worried that you might forget to hang on; what I want to know is this: if it becomes necessary to ''let go'' of that switch, can you do it?
-->-- Creator/RobertAHeinlein's ''Literature/BetweenPlanets''

A backup plan in case of untimely death or incapacitation, used as a threat to protect the holder. If that person dies or fails to issue some form of communication within a set period of time, the plan goes into action automatically, making it in the interests of the threatening party to not harm that person. Provided, of course, that the threatening party knows about it. A common plot involving this trope is the switch is put in danger of being accidentally set off by somebody who had no way to know about it, or something in the system itself breaking causing it to reject [[FailsafeFailure attempts to turn it off]].

A more common twist that is beginning to appear is that of the hero simply cutting off the hand or arm, thereby removing the threat entirely.

If an entire government or culture has a Dead Man Switch, it usually sets off a DoomsdayDevice.

The TropeNamer is a device installed on train locomotives and heavy equipment that shut down the equipment if the operator dies, falls asleep, or otherwise loses control of the machine. Oddly enough, though, you [[RunawayTrain don't see it really used on trains in fiction...]] [[DeadFootLeadfoot or cars for that matter.]] The real life counterpart to the threat aspect of this trope is a [[http://en.wikipedia.org/wiki/Fail_deadly fail deadly]] system.

LoadBearingBoss is a sub-trope that usually applies to video games. See also DefeatEqualsExplosion when the dead man switch is part of the holder. This can be a subtrope of MyDeathIsJustTheBeginning, if the plan is big enough. In some cases, the holder may trigger it deliberately to invoke TakingYouWithMe.

!!'''As a DeathTrope, some spoilers will be unmarked ahead. Beware.'''



[[folder:Anime & Manga]]
* ''Manga/DeathNote'':
** Rem lets Light know that if Misa dies unnaturally, she'll assume Light did it and kill him.
** L was able to safely reveal his identity to Light in private once L made it clear that, if he were to die soon after, other people would be able to use it as evidence that Light (the prime suspect) was the murderer.
** Watari maintains a computer link to the orphanage he runs, and reports in at regular intervals. When Rem kills both him and L, at the proper time the computer reports "L is dead". This is a cue for the man currently operating the orphanage to send out L's successors, Near and Mello, to continue the Kira investigation.
* In ''Anime/EurekaSeven'', Colonel Dewey pulls a literal Dead Man Switch upon his suicide, in which a collar that Eureka had been wearing through out the series forces her to become a second Control Cluster which will cause the end of reality as we know it. This from the guy whose stated aim was to save the world. He rationalizes minutes before that the Scub has irreversibly tainted the world, and thus it is better off not existing.
* In ''Anime/CodeGeass'', during his final standoff with Suzaku at the end of season one, Lelouch/Zero straps a bomb to himself that he claims will detonate if his heart stops. [[WordOfGod The writers admitted]] that it was added when they realized that otherwise, his opponent would have [[JustShootHim just shot him]]. When the cliffhanger is picked up next season, Suzaku tackles him to the ground and removes the bomb.
* In ''Manga/HunterXHunter'' Netero turned out to be wired to a [[FantasticNuke "Miniature Rose" bomb]] that detonates when his heart stops in case he'd lose to [[BigBad Meruem.]]
* In ''Manga/DetectiveConan'', Conan employs a Dead Man Switch on a tape recorder to keep Vermouth from killing him after his plan to capture her goes south and he's captured instead. If the recorder is disconnected or he dies, her boss's ringtone and all conversation captured will be sent straight to the police.
* Uryuu Minene uses one of these in ''Manga/FutureDiary'' when she holds up a school, derailing an attempt to snipe her because it's attached to a bomb.
* The ''Anime/MobileSuitGundamWing'' sequel novel ''Frozen Teardrop'' has a particularly extreme version of this: the Perfect Peace Plan, in Relena Peacecraft's death would cause the {{Nanomachines}} secretly administered to Martian colonists to form blood clots and kill an estimated '''three billion people'''. Relena had to be [[HumanPopsicle put in cryogenic stasis]] until such a time as a solution could be devised.
* In ''LightNovel/{{Campione}}'', Erica blackmails Liliana about the erotic novels she secretly writes. Erica memorized them and inserted their contents in her will, so Liliana can't kill her to keep it secret.

[[folder:Comic Books]]
* The first issue of ''[[ComicBook/GIJoeARealAmericanHeroMarvel G.I. Joe Special Missions]]'' features a terrorist group who've hijacked an airplane; one terrorist wears an explosive vest with a dead man switch set to go off if he releases the trigger. He gets zapped with a taser, causing all of his muscles to contract while incapacitating him.
* One story in the ''Endless Nights'' book, part of Neil Gaiman's [[ComicBook/TheSandman Sandman]] series, has a version of this combined with HeKnowsTooMuch. An archaeologist called out on a seemingly ordinary dig discovers it's not so ordinary. When TheMenInBlack finally come in and try to close down the site, the archaeologist reveals that a bot will email a detailed account of the dig to multiple online news sources unless she checks it every 24 hours. They let her go.
* In ''{{ComicBook/Fables}},'' a plucky reporter investigating Fabletown (actually, he's under the impression they're vampires) has a system set up that if he's killed, all the information he's gathered about Fabletown will be released to the press. The Fables have to arrange an elaborate blackmail/con to convince him to defuse the threat. And then Bluebeard kills him anyway.
* When Comicbook/ThePunisher finds himself in a trap set up by various criminals in the ''Comicbook/SuicideRun'' event, he lets them know that the building they are in is fitted with explosives, and in his left hand is a dead man's switch which will make them go if he is killed. He then proceeds to start shooting, and there's nothing that the criminals can do to stop him.
* [[ComicBook/TheDeathOfClarkKent The Conduit Saga]]: After Kenny Braverman dies, a mechanism is set off that tries to kill Jimmy Olsen, and if possible, Comicbook/{{Superman}} along with him.
* When [[Comicbook/IncredibleHulk Bruce Banner]] starts working for Comicbook/{{SHIELD}}, he first sets up one of these in case they decide to just kill him to neutralize the threat presented by the Hulk. Prior to his initial meeting with Maria Hill, he steals ''highly'' classified information -- implied to be damning enough to bring down the whole organization if released -- and gives it to a contact (who turns out to be Daredevil) along with instructions to release it if Banner doesn't check in with him on a regular basis.
* The [[ComicBook/InjusticeGodsAmongUs prequel comics]] for ''VideoGame/InjusticeGodsAmongUs'' reveal that Metropolis was destroyed by a nuclear bomb when Superman kills Lois by taking her into space, hallucinating that she's Doomsday. Oops!
** It gets worse: She was also pregnant with his child.
* ''Star Wars: Dark Times'': When Jedi Master Kai Hudorra tries to bluff Darth Vader with a thermal detonator set as one of these, Vader simply keeps it pressed with The Force, 'sabers the guy up, and then blows the place anyway just for the heck of it.
* ''[[ComicBook/TheTransformersMegaseries Transformers Spotlight: Shockwave]]'' has Grimlock set one up before the Dynobots go to fight Shockwave. Once they all get put into stasis lock, the ship fires on a nearby volcano, burying all six combatants.

[[folder:Fan Works]]
* In ''[[FanFic/SovereignGFCOrigins Origins]]'', a ''VideoGame/MassEffect''[=/=]''Franchise/StarWars''[=/=]''VideoGame/{{Borderlands}}''[[spoiler:[=/=]''[=Halo=]'']] MassiveMultiplayerCrossover, clones of Athena are wired with such a device combined with HollywoodAcid to avoid TransformationHorror courtesy [[ParasiteZombie Parasite Zombies]].
* In ''FanFic/ThePowersOfHarmony'', Ophiuchus has a variant of one of these. Namely, [[spoiler: as the subconscious of [[PoweredByAForsakenChild Horizon]], he can break the barrier over the Gate of Tartarus whenever he wants. Such a thing will obviously kill him, but he uses it as an ultimatum to control Blair and the other Echoes.]]

[[folder:Films -- Animation]]
* In ''WesternAnimation/{{Zootopia}}'', a proper train dead man's switch is shown [[spoiler: when Nick and Judy find Doug's night howler lab, in an abandoned subway car]]. During the escape scene, [[spoiler: Nick]] is shown having to apply constant pressure on the switch [[spoiler: and deliver even more when Judy tells him to accelerate]], which puts said character into the NonActionGuy role in order to keep the escape going.

[[folder:Films -- Live-Action]]
* In ''Film/TheUsualSuspects'', Kobayashi lets the protagonists know that if he dies under suspicious circumstances, his boss Keyser Söze will immediately know who did it and take revenge on them and their families.
* In ''Film/{{Goldfinger}}'', a captured Film/JamesBond implies that his death or vanishing will just activate another agent, presumably one that would assume 007's loss to be the direct result of Goldfinger himself. It's not revealed if 007 is bluffing or not, but Goldfinger decides to not call him on it and lets him live for the time being.
** There is at least some bluffing. Bond claims that his replacement also knows about "Operation Grand Slam". Goldfinger initially (and correctly) concludes that Bond only knows the name, but Bond convinces him that that is a chance he can't take. Goldfinger then decides to keep Bond alive, but captive, to prevent another MI6 agent from sabotaging his plan.
* ''Film/DrStrangelove'' and the whole Soviet "Dead Hand" protocol. The big irony in this movie was that the Soviets hadn't got around to actually telling the world when General Ripper ordered his bombers to attack.
* In ''Film/SawIII'', Jigsaw has his heart rate monitor hooked up to a device that will kill Lynn if he flatlines, which he eventually does when her husband Jeff kills Jigsaw. This one has a twist, in that initially it's not about preventing somebody from killing him but coercing them into keeping him alive (despite late-stage cancer) for as long as possible.
* The premise of ''Film/CrimsonTide'' basically deals with this possibility on a government-wide level (see Real Life examples below).
* In ''Film/{{Ronin}}'', Stellan Skarsgård's character does this when "negotiating" over the case. He has to call by a certain time, or the Russian's girlfriend will be shot by a sniper. The Russian elects to let her die.
* In ''Film/AnalyzeThis'', mobster Paul Vitti declares that he wants to get out of the Mafia, so he's written down "a few things" about every other mob boss and put the documents in safe hands in case somebody decides to do him in.
* In ''Film/{{Speed}}'', Howard Payne has a bomb wired to a Dead Man Switch, so that if he is killed, his finger releases the switch and it goes off. He does this while taking the LoveInterest hostage, since last time he tried this he was the victim of ShootTheHostage.
** The main trigger for the bomb is also a Dead Man Switch, activated if the bus drops below 50.
** The bus also has a second Dead Man Switch in that the bomb will be triggered if anyone tries to get off, and with a plethora of news crews filming and a secret camera installed on the bus, Payne ''will'' know if someone tries. In essence, he's installed two switches, one that will blow if his instructions are disobeyed while he's alive, and one if the same happens when he's dead.
* In the film version of ''Film/{{Spawn}}'', CIA director Jason Winn has a device installed near his heart that, if his heart ever stops, will send a signal out to an automated system designed to release a devastating virus all over the Earth. Oddly, even the "normal" members of the CIA are shown thinking that this was a good idea ("Now, no one will ''dare'' kill you, sir!). It apparently never occurs to anyone to think about what would happen if the guy gets into a car crash, has a heart attack, or is assassinated by somebody who ''doesn't'' know about the top-secret weapon. When informed about this, Spawn manages to use his magic to remove and deactivate the device.
* In ''Film/IRobot'', Dr. Alfred Lanning left behind instructions for Will Smith's character, Del Spooner, in the event of his death. His suicide near the beginning of the film sets in motion Del's investigation.
* ''Film/Terminator2JudgmentDay''. Inventor Miles Dyson makes a HeroicSacrifice by standing between the escaping heroes and a pursuing SWAT team, hand-holding a heavy piece of wreckage over a detonator switch as his last labored breaths flutter from his bullet-riddled body. It also shows that he doesn't really want to kill them, as he warns them to get out.
* The BigBad of ''Film/{{Hancock}}'' is holding a Dead Man Switch that will detonate a bomb attached to his hostages if his finger releases the trigger. Hancock takes his hand with him.
* In ''Film/PointBreak1991'', Bodhi tells Johnny Utah that if doesn't meet with another robber at a certain place, that robber will kill Utah's girlfriend.
* At the end of ''Film/{{Dredd}}'', Ma-Ma tries to use one of these to get Dredd and Anderson to back off. It's hooked to her wrist, monitors her heartbeat and will set off all the explosives she's stashed on her floor -- of which there are enough to level the upper stories of the megastructure. Dredd shoots her, asks her what the signal's reach is through 200 levels of concrete, and throws her off the balcony. As it turns out, not far enough to allow her posthumous retribution.
* A plot point in ''Film/TheTakingOfPelhamOneTwoThree'', about the hijacking of a UsefulNotes/NewYorkCitySubway train for ransom. The police are wondering how the criminals intend to get away, and suggest they might try jumping off while the train is moving. The dead-man's handle is explained; however the criminals rig up a construction that holds down the lever for them.
* A legal variant in an obscure Creator/JetLi film called ''Hitman''. A Yakuza/War Criminal type boasts he is protected by a "Revenge Fund" that will activate if he is killed, which promises a phenomenally large reward to the one who tracks down his killer. True to form, the entire city's Underworld wakes up at the promise of money when he is actually murdered.
* In ''Film/MacheteKills'', Mendez has the missile programed to launch if his heart stops, preventing Machete from killing him. [[spoiler:Voz eventually kills him, but [[BeatStillMyHeart keeps his heart functioning in a jar]].]]
* ''Film/LockUp'': In the climax, Frank Leone takes the evil Warden Drumgoole hostage and throws him into the reactivated electric chair in the prison's defunct death row section. Then he ties his hands to the switch, so he can make his speech about all the bad things the Warden did to the guards while they're unable to shoot him. [[spoiler:Frank was bluffing. The chair was never active.]]
* In ''Film/TheBigHeat'', Mrs. Duncan's arranged to have her husband's suicide note sent to the press in the event of her death. When she does get killed, the published document brings down Lagana and his empire.

* Done several times in the Enderverse:
** Valentine threatens Peter with something like this in ''Literature/EndersGame''.
** In the ''Literature/EndersShadow'' series, Bean and Petra are concerned that the MadScientist Volescu had one set up for after his capture, possibly triggering a virus to fundamentally change the human race. In a more heart-warming example, Sister Carlotta has a note prepared to be sent to Bean that will automatically be sent to him if she doesn't check in for a period of time. Considering that he only receives it after her death, he realizes that Carlotta cared enough for him to do something every day of her life.
* Raven from Creator/NealStephenson's book ''Literature/SnowCrash'' is very large, very deadly, and has poor impulse control, but the reason why almost everyone gives him a wide berth is that if you were to somehow kill him, allegedly a trigger attached to his brain would set off the (very real) ''nuclear warhead'' attached to the sidecar of his motorcycle. No one wants to risk it.
* In a slightly different example, Havelock Vetinari of Literature/{{Discworld}} fame installed multiple GambitRoulette Dead Man Switches in the city of Ankh-Morpork which are neither magical nor mechanical, but ''political'' in nature, thus ensuring that a Discworld with him will be much better than a Discworld without him. However, he is also slowly taking the time to set up a proper police force and bureaucracy for the city, making sure that after he's gone, the city will still thrive.
* In John Grisham's ''The Partner'', the eponymous character had stolen millions of dollars from his law firm and fled the country. When mercenaries track him down and abduct him, his failure to call in to his co-conspirator puts into action an elaborate plan to locate and free him.
* In the ''Literature/StarTrekNewFrontier'' book series, the Redeemers place a special virus in their priests' blood. Should that priest be slain by anything other than natural causes, the virus goes airborne and obliterates all life on the planet it's on. In ''Dark Allies'', they place a priest on a random world to blackmail the ''Excalibur'' into helping them fight the Black Mass...thus using a Dead Man Switch as a Dead Man Switch.
** In the ''Double Helix'' novel, the BigBad knows the circumstances between Calhoun and his [[TheDragon Dragon]] [[note]]Basically, Calhoun brings the guy's operation down around him and nearly kills him before the BigBad rescued him[[/note]], but he also makes it abundantly clear that they're both on the same team now (Calhoun is deep undercover again.) Thus, he tells them that should one of them die, he'll immediately assume the other did it and kill him.
* The short story "[[http://www.concatenation.org/futures/deathswitches.pdf A Brief History of Death Switches]]" by David Eagleman, though the eponymous death switches are not of the revenge sort but rather the "communicating from the grave" sort.
* From Creator/RobertAHeinlein's writings:
** In ''Literature/BetweenPlanets'', to prevent the ship ''Little David'' from being captured by the Federation, it has a [[SelfDestructMechanism bomb]] attached to a Dead Man Switch, to which Don Harvey is assigned as his battle station.
--> '''Capt. Rhodes''': ... I'm not worried that you might forget to hang on; what I want to know is this: if it becomes necessary to ''let go'' of that switch, can you do it?
** A better one is in ''The Long Watch'' features a man holding off a coup seeking nukes by placing them on a deadman switch. He hasn't the guts to kill himself and set them off and foil the coup that way, but if it only works if he's dead...
* In Creator/TimothyZahn's ''Literature/HandOfThrawn'' duology it's established that Thrawn had a clone in his secret base who would be released a period of time without Thrawn's intervention. Although, given the period of time that passes... he obviously didn't put a great deal of thought into the delay.
** In the ''Comicbook/XWingSeries'' novel ''Mercy Kill'', [[spoiler:a rather literal version is pulled by the Wraiths. They're currently besieged in an old observatory, with rescue inbound, but their leader has been killed. The Wraiths are unable to take the body along, but they also can't let the enemy know any of their identities, even of the deceased. The body is partially disguised, placed upright, and left out in the open for the enemy to find, while the Wraiths escape. Soon enough, Mooks find the body, but a single curious tap tips it over... triggering the pressure-sensitive explosives underneath, [[StuffBlowingUp blowing up the entire installation]]]].
* ''Literature/TheDresdenFiles'':
** Mavra in ''Literature/DeadBeat'' had one set up in one of the books. She had evidence that Murphy had killed people (they were [[TheRenfield Renfields]]) and that Mavra was going to send that evidence to the cops. In Mavra's words, "I won't kill her. I'll ''unmake'' her." Dresden quickly comes to the idea of killing Mavra. Seconds later, Mavra tells him that, unless she says otherwise, the evidence will still be sent. So if she dies, there's no one to rescind the order. Fortunately, at the end of the book, Dresden makes up for it by threatening Mavra in an [[CrowningMomentofAwesome incredibly ballsy and spectacular way.]]
** Every wizard is potentially one of these. When a wizard is dying they can unleash a Death Curse that will seriously mess up its target. The scope of the effect varies by the power of the wizard. Some Death Curses will just strip the killer of all their magical power (potentially lethal to another wizard or magical being) while others might destroy a few city blocks or an island.
** In the short story "The Warrior," the villain holds one of Michael Carpenter's daughters hostage with detcord (i.e. explosive dynamite-like cord) wrapped around her, with his hand on a dead-man's switch. If the villain dies OR Harry gets too close or uses too much magic (he is a WalkingTechbane), it detonates.
* In the ''Literature/CodexAlera'' series, the High Lord Kalare has one of these. If he dies, he has magically set the Great Fury Kalarus to destroy his entire city, killing tens of thousands of people.
* In ''[[Literature/TheEnemyPapers The Tomorrow Testament]]'' there was a confrontation where an alien whose scheme was uncovered asked what would prevent him from killing them all right away. The answer was that a big fleet moves to bombard his planet, and if they are dead no one will be able to cancel the current order in time. There would be some repercussions, a lot of turmoil... but this will happen ''after'' the fact.
* In the Creator/StephenKing novella ''[[Literature/DifferentSeasons Apt Pupil]]'', Todd Bowden, while blackmailing Kurt Dussander, claims he left a letter (exposing Dussander) with a friend, to be opened and read in the event of his own death. Then when Dussander turns the tables and blackmails Todd, he claims that he left a complete account of Todd's actions in a bank deposit box, to be opened and read on the event of Dussander's death. They're both bluffing.
* In ''Literature/AgainstADarkBackground'' by [[Creator/IainBanks Iain M. Banks]], the BigBad claims to have rigged his Dead Man's Switch to a whole network of bombs rigged destroy most of the critical infrastructure in the star system in which the novel is set, plunging it into (yet another) post apocalyptic dark age. The heroine is unimpressed, and messily kills him anyway. (The ending is ambiguous about whether he was lying to try to keep her from trying that.)
* In ''Literature/RevelationSpace'' by Creator/AlastairReynolds, Dan Silveste claims to have an antimatter bomb concealed in his tooth that will destroy everything within a kilometer if he dies or if his demands are not met.
* In ''Literature/{{Ragtime}}'', when Coalhouse and his allies take over the Morgan Library and rig it with explosives, it's mentioned that Mother's Younger Brother has the detonator set up so that it will be triggered if he (Younger Brother) is shot. (This being the early 1900s, this just means that he's sitting in such a position that he'll fall on it if he dies.)
* In Dean Koontz's ''Frankenstein'', [[MadScientist Helios]] used several methods to ensure that his creations couldn't turn on him. One of these was a signal that would be sent out on his death, killing every one of his creations.
* The entire village of Caer Dallben is protected by a magical version of this in ''Literature/TheChroniclesOfPrydain'' of Lloyd Alexander. Played with in that no one knows the "switch" even exists until an attack is attempted in the final book, since the village's protector, Dallben the enchanter, had mostly concealed the full extent of his powers up to that point in the story.
* ''Literature/VorkosiganSaga'':
** In ''Literature/{{Cryoburn}}'', a doctor who discovers a deadly secret about the cryo-preservation company he works for goes to outsiders for help, and is instructed to secure a copy of his information with a lawyer or a bank, to be released in the event that he dies or disappears or gets frozen. When the doctor gets caught by the company and dosed with TruthSerum, his savvy questioners get him to reveal where it is; however, he ''also'' reveals that two of the outsiders he talked to had taken copies of his information and made their own arrangements, giving the doctor's dead man switch some redundancy. And since the [[CorruptCorporateExecutive Corrupt Corporate Executives]] had, in the meantime, turned one of them into a HumanPopsicle and killed the other one DeaderThanDead...
** Mark's brilliant business meeting in ''Literature/MirrorDance''. He had a valuable piece of merchandise -- in this case, a code-ring worth billions of dollars, still on the original owner's hand -- attached to a charge, while he held the dead-man switch and negotiated with the man's business rival/half-brother.
-->'''Mark:''' Stun me or shoot me, and it will go off. Frighten me, and my finger might slip. Tire me out, and it might give way. Annoy me enough, and I might let go just for the hell of it.
* In Creator/MatthewReilly's ''Area 7'', the villain Caesar traps the President and his bodyguards in a remote facility, and has placed a transmitter on the President's heart. If his heart stops beating and the signal stops, dozens of nuclear bombs around America will detonate. However, in the case that the President survives and Caesar and his men die to the President's bodyguards, Caesar has placed a transmitter on his own heart, that will detonate the bombs if he dies.
* In ''Literature/TheMillenniumTrilogy'', counselor Bjurman rapes Lisbeth. Lisbeth secretly videotaped the event, and sets the video to be spread to authorities, if Lisbeth dies or gets captured.
* In ''Literature/TheFateOfPaulTwister'', Amber tells a problematic duke that she's arranged one that will bring the wrath of the king down on his head if anything happens to her. It's left unclear as to whether or not this is a bluff, but he backs down.
* In David Weber's ''Literature/HonorHarrington'' series, specifically Honor Among Enemies, there's a double version of this; a terrorist has taken over an entire planet, and when Honor tries to liberate it, he reveals that he has bombs planted under major population centres, which he can detonate himself, and will be detonated if she tries to take him out with an orbital strike; he uses this to bargain for safe passage out of the system. When he leaves the planet's orbit, he'll be out of range and can't set them off any more - so he insists on having Honor as a hostage until he can meet a waiting ship. Honor agrees, but brings her own dead man switch; a charge on the outside of their shuttle that will detonate if she doesn't enter a code at regular intervals. [[spoiler:Unknown to the terrorist, she has another plan; her 'switch' is concealing her old fashioned gun, undetectable by common modern technology, and when they're out of range she uses it to kill the terrorist.]]
* A character negotiating with pirates in ''Literature/InvasionOfKzarch'' tries to use a deadman's switch and bombs to ensure his safety. The pirates simply toss him out of the gunboat and shoot him.
* ''Literature/TheExecutioner''. When Mack Bolan takes on the San Francisco mafia, TheDragon insists that the soldiers of every underboss are brought under his direct control to deal with TheDreaded 'Bastard in Black'. He then [[TheStarscream smugly waits for Bolan to kill his boss]] so he'll have control of the entire city. Next thing TheDragon knows, his irate boss is on the telephone saying that Bolan strode into his house, killed all his soldiers and ''left him alive'' (as Bolan is running his own BatmanGambit). The boss declares that he's put out a sealed contract on TheDragon -- if he dies by Bolan's hand, TheDragon also dies. Not knowing who, or even how many, killers might have the contract, TheDragon has no choice but to get serious about stopping Bolan.
* In a Franchise/{{Superman}} ''Which Way'' game book, Lex Luthor uses one of these. He informs Superman that his computer equipment would shoot a deadly laser at Metropolis if it detected any physical injury inflicted on Luthor.

[[folder:Live-Action TV]]
* The plot of ''Series/TheOuterLimits1995'' episode "Dead Man's Switch" revolves entirely around this trope.
* In ''Series/RobinHood'': The Sheriff of Nottingham has stated that if he dies an unnatural death, the entire county of Nottingham will be effectively destroyed by Prince John's forces. Recently, the system was accidentally activated when the Sheriff went sleepwalking and it was only shut down just in time.
* In the 1970s TV version of ''ComicBook/CaptainAmerica'', the superhero fights a villain trucking a NeutronBomb for a terrorist plot by not only attacking the driver, but bending an exhaust pipe so it vents into the trailer to subdue any guards of the bomb. Unfortunately, when Cap investigates inside he finds out that the main villain was in there, is near death from his attack and he has a Dead Man Switch that would detonate the bomb if the villain's heart stops. Thus Cap and his MissionControl superior have to frantically apply first aid to prevent the detonation.
* Turned UpToEleven in ''Series/{{Farscape}}'': near the end of the series, John walked into enemy territory to negotiate wearing a portable nuke with Dead Man Switches "from every culture on my ship and a few cultures I haven't heard of," that would activate if his heart stopped, sped up, or if he got "too hot, too cold, too happy, too sad, thirsty, hungry, [[OverlyLongGag bored...]]"
** The "too happy" was actually true, he had to tell his girlfriend not to stand too close to him because then the nuke would start beeping faster as his heartbeat sped up.
* In ''Series/{{Lost}}'', the mercenary Keamy, the man who killed Ben's daughter Alex, has one of these connected to his heart, set to trigger a large explosive in the event of his death. [[PapaWolf Ben Linus]] [[UnstoppableRage doesn't care.]]
* In an episode of ''Series/BabylonFive'', Lennier saves the day through one of these. He programs the White Star's computer to immediately leave the area ([[{{Mordor}} Z'ha'dum]]) if he doesn't touch a control every few minutes. Sure enough, a Shadow device starts screwing with everyone's mind, and the White Star is able to escape because he stops touching the control while under the influence.
** In an earlier episode, a villain was threatening to blow up a station using one. The explosives were removed before the switch was released.
** After gaining control of Edgars Industries, Garibaldi fires the Board of Directors and warns them that any further assassination attempts will trigger large bounties on each of their heads.
* In the two-part season one finale of ''Series/BurnNotice'', Michael plants various C4 charges around a nightclub owned by a heroin dealer and uses a detonator with a Dead Man Switch to force the dealer into giving him the information he needs to rescue Sam.
* In an episode of ''Series/SWAT1975'', the boss of a bunch of crooks tries to escape by wiring himself to a bomb, with the switch in his hand. He demands and gets a truck, which he tries to escape in, driving one-handed. Naturally, something gets in his way, and he has to put both hands on the wheel -- releasing the switch. Boom.
* In the third season two-part finale of ''Series/{{Highlander}}'', Kalas got his hands on a CD-ROM disk that contained information on every known Immortal and Watcher. He has it rigged up to his computer so that if he does not return in a certain amount of time, the information on the disk will be sent to the media, telling the entire world about Immortals.
** An episode from the last season had a man wearing a bomb vest that was wired to his heart rate so it would go off if he was killed. The female bounty hunter Immortal pursuing him got around it by [[spoiler: shooting him in the head so his heart wouldn't stop right away, allowing her a few seconds to tackle him out the window and into the water below]].
* Percy in ''Series/{{Nikita}}'' has one set where, should he die, it will send a message to the Guardians of all of the black boxes to release all of the information on the boxes to the public. The boxes are hard drives containing all of the illicit operations of the United States government for a long time. Should that information be released, it would tip the balance of world power. Because of this, Team Nikita is currently working on plan GottaKillEmAll before launching an assault on Division HQ.
** Percy later uses another variation of the same system. If he dies, his henchman Roan will receive the signal to immediately start a nuclear meltdown in the middle of Washington DC. As a second layer of protection, if Percy does not phone Roan by a certain time, Roan will also start the meltdown since it will mean that Percy has been captured.
* Appears in the series 2 finale of ''Series/{{Luther}}'', where the villain holds a dead man's trigger attached to a suicide vest, and walks around London, untouchable. Averted when Luther convinces him to disable it under the ruse of a game, and has him shot.
** And at the end of the episode, Luther gets a female gangster who was blackmailing him to back down by saying that if anything happens to him or the woman he's protecting, a certain [[TokenEvilTeammate sociopath of his acquaintance]] will do something very nasty in response.
* ''Series/TheEqualizer'' is protecting the ex-wife of a CorruptCorporateExecutive, whom [=McCall=] discovers has hired a man to kill her. [=McCall=] arranges for his FriendOnTheForce to put information in the police database that he is also a contract killer, then explains to the executive that if his wife dies of any cause, even [[MakeItLookLikeAnAccident natural]] ones, [=McCall=] will kill him.
* The accidental activation of a fictional website similar to "You Were Left Behind" (see "Real Life" below), notifying those Left Behind that the Rapture has occurred, was the event that triggered the discovery of the body in the ''Series/LawAndOrder'' episode "Rapture."
* ''Series/{{Smallville}}'': In "Resurrection", Garrett straps a kryptonite bomb to his chest with his finger on the trigger and holds a hospital hostage. A deputy sniper kills him and his finger comes off the trigger, but Clark Kent manages to wrap the bomb in a lead apron and rush it away at super speed before it explodes.
* In the ''Series/{{Haven}}'' episode "Chosen", Mara turns Duke Crocker into a "Trouble Bomb" and warns that he will activate if she is either killed or not allowed to return to her home dimension by the end of the day. [[spoiler:Charlotte tries to get around this and end her threat by [[SplitPersonalityMerge merging Mara back with Audrey Parker, with Audrey in control]], but to everyone's horror, this apparently counts as killing her and Duke "detonates".]]
* ''Series/StarTrekVoyager''. Voyager forms an EnemyMine alliance with the [[HiveMind Borg]], who grants them passage across their territory in exchange for a weapon against [[OutsideContextProblem Species 8472]]. To prevent the Borg from simply assimilating everyone, all information on the weapon is downloaded into their Emergency Medical Hologram, who promises to delete his own program at the first sign of trouble. "[[GallowsHumor Well, maybe not the first sign...]]"
* ''Series/{{Blindspot}}'': In "Any Wounded Thief", the heroes confront a corrupt general and find him in a building full of chemical weapons. He reveals he's wired the place with explosives, and warns that if his thumb comes off the detonator, the building will blow, releasing a multitude of deadly gases into the air that will likely wipe out the city. Jane manages to get close enough to simply snatch the detonator away, put her own thumb over the button lightning fast, beat up the general, then disassemble the detonator.
* ''Series/Daredevil2015'': Leland Owlsley and Madame Gao conspire to have Wilson Fisk's girlfriend Vanessa poisoned in an attempt to get Fisk to focus on his crime business. When Fisk finds out and confronts Owlsley, Owlsley reveals that he has a switch: he's stashed away Carl Hoffman, one of the corrupt cops on Fisk's payroll. Owlsley checks in with him once every 24 hours and if Owlsley doesn't show, Hoffman will go to the FBI and rat on Fisk. The enraged Fisk kills Owlsley by throwing him down an elevator shaft, then sends the other corrupt cops in his pocket to search for Hoffman.
* ''Series/SonsOfAnarchy'': A variant with drug kingpin Damon Pope who, to ensure his own survival, has arranged a kill contract to be activated in the event of his death, offering a huge reward to whoever assassinates his killers. [[spoiler:Jax gets around it by framing Clay Morrow for Pope's murder.]]
* An episode of ''Series/ModernFamily'' references the actual switch on trains when an mystery novel author with a focus on realism is frustrated by how all of his attempts to figure out how an engineer can cross a train unseen to commit murder are dashed by having the switch described to him.
* In ''Series/TheFlash2014'' ChristmasEpisode "[[Recap/TheFlash2014S2E9RunningToStandStill Running to Stand Still]]", Captain Cold claims to have built one into his cold gun. It's left ambiguous whether he really has, but he's certainly CrazyPrepared enough to do so, and [[Comicbook/TheFlash Barry]] decides not to call his bluff.
* The Season 5 finale of ''Series/{{Arrow}}'' has one of these as a major plot point. As part of his final gambit against Oliver, [[BigBad Prometheus]] kidnaps all his loved ones and drags them to Lian Yu, which he's rigged with enough explosives to completely destroy it, set to go off if he dies. As such, his [[ThanatosGambit plan]] to either kill Oliver in combat or goad Oliver into killing him ([[NotSoDifferent thus proving that Oliver's as big a monster as him]]) is guaranteed to kill Oliver either way. [[spoiler: Oliver [[TakeAThirdOption takes a third option]] by only incapacitating Prometheus, but the latter just kills himself, ending the season on a massive cliffhanger as the entire island explodes.]]
* in the pilot episode of ''Series/StargateAtlantis'', the hero, kills a leader of the Wraith. As she dies, she tells him she and her underlings were not the only Wraith, but just the caretakers for other Wraith, and that when she dies, it will awaken all the Wraith. Once it happens, they see the pods holding the Wraith begin to come alive, and they discover that not only the Wraith on the planet, but all the Wraith in the galaxy had been awakened early from their periodical hibernation.
* ''Series/BlakesSeven''.
** In "Deliverance", the Liberator is hijacked by a man desperate to get medical supplies to his father. When it looks like he's going to collapse from fatigue and his injuries, he rigs his RayGun so it will fire automatically if he loses consciousness. [[spoiler:This is exactly what happens, but fortunately Blake shouts a warning and Cally rolls away in time.]]
-->"I've put the energizer onto automatic. If I let it go, it will spring back and the gun will fire. If I pass out, the gun will fire by itself. Now you make certain that I don't go to sleep!"
** At the start of Season 4, our heroes kill a VillainOfTheWeek and inherit his ElaborateUndergroundBase, only to find in the next episode that he'd set a nuclear destruct device to explode if he hadn't sent a signal every 48 hours. No-one knows how long itís been ticking down either. And they can't get through the door to the hanger deck to escape.
* ''Series/ThePunisher'': Used three separate times. The first is by David Lieberman, who rigs his base with cameras that will send their feed directly to multiple news outlets if he doesn't input a code and complete a retinal scan every three hours -He does this so that if he is murdered, either by Frank or the various government agencies that are after him, the details of his death will be made public. The second is by [[spoiler: Lewis Wilson]], who uses a more traditional setup with an explosive vest when he attempts to assassinate Senator Stan Ori and takes Karen Page hostage. The third is by Lieberman again, using a modified version of his first setup, to blackmail the villains by making their actions public if they do not comply with his and Frank's demands. [[spoiler: However, this one turns out to be a trick, as he had already given Homeland Security all of the information by the time Rawlins and Russo found out about the switch. He keeps the charade up to give him and Frank some leverage over the bad guys, who had taken his family hostage.]]

[[folder:Tabletop Games]]
* ''TabletopGame/DungeonsAndDragons'':
** The spell ''contingency'' is built for this trope. A wizard can set their death as the trigger for pretty much any spell they have in their collection... to the point that the ''TabletopGame/ForgottenRealms'' have a special kind of {{undead}}, [[InfernalRetaliation Blazing Bones]], that is created when someone protected by death-contingency is killed by fire while casting a spell.
** AD&D2 dragon magic of ''TabletopGame/ForgottenRealms'' includes a ''death matrix'' spell. When a dragon "loaded" with it dies, it initiates a massive explosion loaded with scales, bones and dragonbreath. It's permanent and not dispellable.
** D&D3.5 ''Complete Scoundrel'' introduced Fatal Flame -- if the target dies before the spell expires, a mini-fireball explodes immediately, with the power dependent on Hit Dice.
* ''TabletopGame/Warhammer40000'':
** Due to the highly dangerous nature of the game's magicians (psykers), they are all shipped off to Terra where most of them are psychically fed to the Emperor and a few are trained to use their abilities for the Imperium. The places they're held at on their planets usually come equipped with a Dead Man Switch: If anything goes wrong, all the held psykers are instantly gassed. Considering what kind of trouble several hundred untrained and unsanctioned psykers can be, either on their own or as fodder for another entity, this can be considered justified.
** Also, the Imperial Infantryman's Uplifting Primer recommends shooting any psyker seen without his "honor guard" of three other guardsmen (whose main purpose ''also'' entails shooting him if he happens to show signs of unusual behavior -- [[TheCorruption like having a tentacle grow out of his chest]]).
** Let's not forget the Penal Troopers, who are convicted criminals given one last chance to serve The Emperor. They get to charge the enemy wearing explosive collars, with a commissar holding the detonator. If the bomb doesn't go off, they are absolved of sin and free to go. Of course, they are also standing in front of a hostile army, unarmed.
** The new Space Wolves HeroUnit, Lukas the {{Trickster}}, has [[SuperSoldier one of his hearts]] (ripped out by a Dark Eldar pirate, he survived) replaced with a stasis bomb -- if he's ever killed, everyone around him ([[TakingYouWithMe probably including his killer]]) will be [[AndIMustScream trapped in stasis for eternity with his laughter]].
* In ''MagicTheGathering'', several cards give benefits to you or harm other players upon their removal from play. The most successful of these is [[http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=29936 Standstill]], a card whose switch is a spell being cast. An entire deck archetype was built around it.
* In ''TabletopGame/{{Exalted}}':
** The Scarlet Empress ensured that the most ambitious of her children would not only not kill his siblings, but would be forced to be their protectors, by decreeing that he would be executed if they should die under any circumstances.
** The Guild, the worldwide alliance of merchants largely made up of mortal humans, also has a favoured tactic of protecting themselves against gods and Exalted by setting up disasters to be enacted if they should die.

[[folder:Video Games]]
* ''VideoGame/SplinterCell'':
** This trope is the crux of the plot of ''Pandora Tomorrow''; the BigBad radios certain people once a day to give them the code phrase "Pandora Tomorrow" to delay his plan to strike America by a day, requiring the player and their allies to remove the smallpox-carrying bombs that would be the first strike before the player can take out the bad guy. In a meta-sense, this sort of thinking is also why they specifically capture him rather than just assassinate him like they did with the big bad of the first game.
** The prologue mission in ''Double Agent'' has a similar situation, where the commander of the facility you're infiltrating, once he realizes what's going on, ignites a flare and threatens to drop it into a vat of gasoline; where it kind of falls flat is that if you shoot him or get spotted by him, he drops it and blows the place up, but if you sneak up and grab him... it still falls through the catwalk and into the gas, but doesn't ignite it for some reason.
* The first four Robot Masters you fight in ''VideoGame/MegaMan7'' were activated by a Dead Man Switch a couple months after Dr. Wily was sent to prison at the end of the last game.
* The "Auto-" spells and effect [[VideoGame/FinalFantasyVII materia]] in ''Franchise/FinalFantasy'' games and inspired series work much the same way as Contingency in Dungeons and Dragons (useful when the Dead Man's Trigger is set to bring the operator BackFromTheDead).
** ''VideoGame/FinalFantasyVI'' has a famous example with the BonusBoss at the top of the Fanatic's Tower. If you manage to survive the incredibly lengthy staircase gauntlet (with no save points), and beat the boss, he'll cast Ultima before dying, killing the party. Fortunately, it was the game that introduced the Auto-Life spell to the series, which is the only way to win without excessive grinding or taking forever to drain the boss's MP to zero.
*** And he's far from the only one; this game has many bosses and EliteMooks that have some kind of desperation attack they'll perform right before they die, in an attempt to [[TakingYouWithMe take someone with him]].
** In ''VideoGame/FinalFantasyVII'', the Final Attack materia is a linking materia to set up a spell or action when the character is killed. Linking either Revive or Phoenix to it pretty much guarantees immortality, as long as you have a way to keep your MP up (MP Absorb + Knights of the Round or Master Summon is a good idea). The number of uses is limited by the materia's level (at most 5), though.
* The Hijacking mission in ''VideoGame/TargetTerror'' has the pilot held hostage by a terrorist with a Dead Man Switch that will trigger a bomb if you kill him. Shoot the remote to disable it. The painful thing of this is that the hijacking mission is the last mission in the game to complete and it's supposed to be the hardest where the terrorist holding the pilot hostage is [[AnticlimaxBoss supposed to be the boss.]]
* In ''VideoGame/{{Marathon}}'', if a player has his fusion pistol charged when he is killed, it will discharge its blast, possibly killing from beyond the grave.
* A [[GoodBadBugs bug]] in ''VideoGame/ModernWarfare 2'' allowed for a similar situation... with a Javelin guided-missile launcher. Whenever someone using the glitch died their missile would launch straight into the ground, killing everyone within 20 feet unless they had a specific combination of perks and equipment to reduce damage from explosions.
* The Aftermath ability in ''Franchise/{{Pokemon}}'' (called Detonate in Japan) does damage to the opponent equal to one-quarter its max HP when the Pokémon bearing the ability is knocked out.
** The Destiny Bond attack has a similar effect except that it [[TakingYouWithMe KOs the opponent when the user is defeated]] if they don't switch out.
* The various members of the QuirkyMinibossSquad in ''VideoGame/MetalGearSolid3SnakeEater'' appear to have switches that blow up their bodies upon their deaths, presumably to prevent Snake or other enemies from capturing them alive or acquiring any intelligence from their remains. The Fear's and The Fury's switches also come close to being a TakingYouWithMe, as the former results in shooting out dozens of poisoned crossbow bolts, while the latter turns into a giant fireball that chases Snake down.
** In ''VideoGame/MetalGearSolid2SonsOfLiberty'', the Patriots are holding Olga's child hostage, and if Raiden ends up dying before completing the mission, they'll kill her too. They claim that Rose is in the same dilemma, but [[GainaxEnding given the circumstances of that ending]], nobody's can really be sure if that's actually the case.
*** Inverted in the case of the nuclear strike; the President needs to both be alive and input his code of his own free will in order to activate it, and if he fails to willingly reconfirm every hour, or if he gets killed, the launch sequence will be nullified (specifically, launch authority will shift to the Vice President, ending the nuclear threat because he's not among the bad guys' hostages).
** The eponymous [[VideoGame/MetalGearSolidPeaceWalker Peace Walker]] is this for the US government; a mobile nuclear launch platform with a top of the line AI capable of launching on its own initiative if the chain of command is out of touch.
* BigBad Clement uses one of these in the finale of ''VideoGame/TheHouseOfTheDeadOverkill''. He uses a remote switch that will blow up the surrounding area, explicitly calling it the trope's title. However, he soon hands it over after revealing he wants to redeem his evil ways, not minding when [[CowboyCop Isaac Washington]] claims he's chucking it out the nearest window as soon as he and Agent G are out of the blast radius (which he indeed does once they're in a helicopter).
* In the first ''[[VideoGame/XCOMUFODefense X-COM]]'', soldiers can prime a grenade or a bundle of TNT to explode when they collapse.
** Fallen "Cyberdisk" units have a habit of blowing up (and taking out entire buildings with them). It requires some effort to kill them in such a way that they won't explode and thus leave Cyberdisc remnants for research.
* Morgan in ''VideoGame/SyphonFilter 2'' has a Dead Man Switch that will blow up the expo center if you shoot him before the bombs are defused. In the first game, killing Girdeux with explosives will set off the virus bomb.
* In the final mission of ''VideoGame/RainbowSix: Rogue Spear'', Kutkin radios his {{Mook}}s every 2 minutes. If you kill any of them before taking him down, he will trigger the nuclear meltdown.
* In ''VideoGame/HalfLife2'', whenever a Civil Protection Officer is killed, his radio emits a lout audible screech, followed by a female voice giving information on the location and officer's status, and ordering other nearby officers to respond.
* In ''VideoGame/WorldOfWarcraft'', when adventurers kill the corrupted Titan Watcher Loken, he utters in his dying breath, "My death... heralds the end of this world." Loken was tasked by the Pantheon to imprison the Old God Yogg-Saron, and an "Algalon fail-safe" mechanism put in place to trigger if Loken met his demise. Unfortunately, the Titans didn't factor in the possibility of Loken's corruption by the whispers of the Old God that he was imprisoning. Hence, in the Ulduar raid instance, adventurers must "convince" Algalon that all is normal.\\\
Subsequently, in Icecrown Citadel, the spirit of Uther the Lightbringer warns Lady Jaina/Lady Sylvanas and adventurers that there must always be a Lich King, and that if the Lich King was destroyed without a successor, resulting in loss of control over the Scourge, the undead would overrun Azeroth like locusts.
* In ''VideoGame/SilentScope'', if you miss the final bullet or hit the BigBad anywhere other than the [[BoomHeadshot head]], [[NonstandardGameOver he detonates the bomb and kills the President]].
* An early mission in ''VideoGame/HitmanContracts'' has you targeting a man in possession of nuclear explosives who is also the target of a SWATTeam; shortly after they storm the ship he's holed up in, he activates one of these to force them to comply with his demands.
* ''VideoGame/FTLFasterThanLight'' has the Rebel Flagship. Killing its entire crew will cause an AI to take over, repairing its systems.
* The first campaign of ''Videogame/ShadowrunReturns'' is called ''Dead Man's Switch'', for good reason: The plot starts when the victim of a serial killer contacts the player through one of these.
* In ''VideoGame/FalloutNewVegas: Dead Money'', the death of any one character will cause a timed detonation of the others' bomb collars, including yours, except inside the casino, where it can only trigger yours while you're on the same floor as them. At the end, once you kill Elijah or he traps himself in the vault, it also triggers your detonation timer, and you only have about a minute to escape the basement before your head explodes.
* In ''VideoGame/InvisibleInc'', guards are equipped with heart monitors which raise the alarm when the individual is killed.
* In ''VideoGame/BatmanArkhamKnight'', some of the Arkham Knight's soldiers exploit Batman's ThouShaltNotKill methods by wearing suicide vests programmed to explode and kill the wearer should they fall unconscious, and making damn sure Batman ''knows'' it, thus protecting themselves from being on the wrong end of a Bat-beatdown.

[[folder:Web Comics]]
* [[http://www.bugmartini.com/comic/dead-men-tell-no-tweets/ One]] ''Webcomic/BugMartini'' strip has Bug plan to do this for his Twitter account, so it displays a dignified death message instead of leaving his last tweet to be about something like his farting problem.
* In ''Webcomic/GirlGenius'', a lone madman attempting to assassinate reluctant tyrant Klaus Wulfenbach [[http://www.girlgeniusonline.com/comic.php?date=20070611 carries one of these]], although it proves less effective than he'd hoped.
* In ''Ask Dr Eldritch'', the titular hero [[http://www.askdreldritch.com/comic493.html brings one]] on a mission to rescue his [[AllTrollsAreDifferent house troll]].
* In [[http://galactanet.com/comic/view.php?strip=228 this]] ''Webcomic/CaseyAndAndy'' strip, it's revealed that Lord Milligan has explosives in his base triggered on his own heart stopping. He is a [[ContractualGenreBlindness traditional villian]], after all.
* In ''Webcomic/GeneralProtectionFault'', Nega-Ki faces off against Ki's group as they're raiding the palace, telling them that she has a dead man's switch to flood the hallway with poison gas. Ki tells her counterpart that she's willing to die to save Nick, but questions whether her counterpart is willing to die to fulfill Nega-Nick's evil plans. Nega-Ki backs down, but moments later, soldiers arrive to capture Ki's group.
* ''WebComic/{{Homestuck}}'''s programming language ~ATH is literally just exploiting this trope.
** Snowman is the reigning champion of this trope. If she dies, ''the entire Alternian universe'' goes down with her. [[spoiler: Doesn't stop Spades Slick from fatally shooting her, though.]]
* In ''Webcomic/GenocideMan'', each of the Genocide Agents does their work with a backpack-sized bioweapon lab that's programmed to release an extraordinarily virulent plague if the equipment is stolen or the Agent is killed. One Agent's [[DrivenToSuicide suicide]] took 250 000 people with him and evacuated Washington State because diving into fresh concrete wasn't [[http://www.genocideman.com/?p=132 quite enough]] to stop it. Joey doesn't have one anymore, however, because [[KickTheDog he kept setting it off on purpose for a quick laugh]] and got hundreds of thousands of people killed in the process.

[[folder:Web Original]]
* ''Wiki/SCPFoundation'', [[http://scp-wiki.wikidot.com/scp-712 SCP-712 "The Impossible Colors"]]. The apparatus has a fail secure system installed in it. If the researcher viewing the FictionalColor is incapacitated and releases pressure on a thumb switch their view of the color will be blocked by a light-absorbing panel.
* Lovelace has one of these in the second season of ''Podcast/Wolf359''. If her heart stops or speeds up too much, a bomb on board her shuttle detonates, taking the Hephaestus with it. [[spoiler:During "Who's There", she takes shrapnel to the stomach, resulting in heart failure on the operating table. While Hilbert manages to get her heart going again, the bomb still explodes, leaving Eiffel -- who was in the shuttle at the time -- stranded in deep space in a broken vessel for 180 days]].

[[folder:Western Animation]]
* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' two-parter "The Crystal Empire", a flashback reveals this to be [[BigBad King]] [[SorcerousOverlord Sombra's]] EstablishingCharacterMoment: After Celestia and Luna initially defeated him via CombinationAttack, [[PyrrhicVictory they quickly learned the hard way that]] [[CrazyPrepared he'd had the foresight to]] [[TakingYouWithMe cast a backup curse to make the Crystal Empire as well as its citizens vanish until his eventual return]].
* In the ''WesternAnimation/BatmanBeyond'' episode "The Final Cut," the last surviving member of the League of Assassins blackmails Batman into protecting him from the villain who has wiped out the rest of the League by hiding a bomb in Gotham City, programmed to go off if he does not enter the proper code every twelve hours. It doesn't do him much good.
* In ''WesternAnimation/StarVsTheForcesOfEvil'', Queen Moon's deal with [[spoiler: [[TheDreaded Queen]] [[NamesToRunAwayFromReallyFast Eclipsa]]]] essentially turns [[spoiler:[[FluffyTheTerrible Toffee]]]] into a living Dead Man's Switch. When he dies, she is freed from her CrystalPrison.
* Brock Samson uses this as a security measure in ''WesternAnimation/TheVentureBrothers'' when he has surgery to remove H.E.L.P.er's head, stuck in his chest like giant annoying shrapnel after the explosive finale of season 3. He nonchalantly pulls the pin on a frag grenade, and sticks it in H.E.L.P.er's mouth. He didn't trust his Argentinian BackAlleyDoctor.
* In ''WesternAnimation/TheTransformers'', Starscream gains control of the Combaticons by adjusting them so that only Starscream can recharge them. Thus, if they betray or abandon him, they will doom themselves. Eventually, they manage to disable that feature, gaining their freedom.

[[folder:Real Life]]
* British missile submarines had (and may still have) the "bolt-from-the-blue" procedure, in case Britain is destroyed by a surprise nuclear attack. This is referenced in the VX episode of ''Series/{{Spooks}}'': when each new Prime Minister enters office, he or she writes letters to the captains of the four ''Vanguard''-class submarines, which are placed unopened in the safe (once the PM leaves, the letters are destroyed unread.) If the submarines lose contact with London, they perform a considerable number of checks (including checking whether they can still pick up the ''Today'' radio programme on longwave). Once they are convinced that Britain is no longer there, they open the safe. There appear to be (according to the Peter Hennessey book ''The Secret State'', the source for this) four things that can be in there:
** Go to Australia, if it's still there.
** Put yourself under American command, if the US is still there.
** Nuke Moscow or whoever actually launched the attack.
** Use your own judgment.
* In some Pennsylvania prisons, guards are equipped with a distress radio that will call in reinforcements if they pull a rip-cord buttoned to their shirt, or if their torso tilts by more than 45°. Thus, if they get into a fight with an inmate and are incapacitated, the distress signal automatically alerts the entire facility.
** Wisconsin prisons have phones that activate alarms if they are left off the hook for 30 seconds.
** Firefighters wear something similar called a [[https://en.wikipedia.org/wiki/PASS_device PASS Device]] (Personal Alert Safety System), also called a DSU (Distress Signal Unit). If the firefighter stops moving, it emits a loud siren to alert another firefighter.
*** In North America this device is incorporated into the firefighter's breathing apparatus and the motion sensor activated when the air supply is turned on. That way, users cannot fail to arm the device in hazardous environments.
* [[http://en.wikipedia.org/wiki/Dead_hand_%28nuclear_war%29 Perimetr]]. A largely, though not entirely, automated "Dead Hand" system which was created as a Soviet nuclear-control system. It's generally speculated to function by use of elaborate, unmanned sensors that track pressure, light, and radiation throughout the country, but must be armed first (hence not being fully automated), which is done so in times of crisis. It's believed that it was created to give the Soviet leadership a way out of being compelled to launch a first strike--even if the entire leadership was annihilated by an American first strike, they could rest assured that Perimetr would retaliate, thereby absolving them of that responsibility (an attractive premise, especially to the aging Kremlin leadership of the late 1970s and early 1980s).
* A website called "You Were Left Behind" sells itself as a service for devout born again Christians who are worried about being taken up into heaven during the Rapture, and want to leave messages for friends and loved ones just in case it happens during their lifetime. The site works (or claims to work) by having a small inner circle of administrators who have to log in at least once every three days. If all of these brave Christian soldiers miss two updates in a row at the same time, then the Rapture must have happened and all the clients' messages will be delivered.
* A similar all-purpose site exists, fittingly enough called [[http://www.deadmansswitch.net/ Dead Man's Switch]].
* During the Beslan terrorist attack in Russia in 2004, the men set up dead man's switches so that if the terrorist were gassed, the bombs they set up would still go off.
* One group of people tried to escape from UsefulNotes/EastGermany by running a checkpoint in a truck. Loaded with dozens of propane tanks on the bed. As expected, none of the guards shot at the truck or tried anything to make it crash and instead just ran out of its path and let it pass through unchallenged.
** Partially subverted, the propane tanks were empty, so shooting them would have done nothing. Of course, the guards didn't know that.
* Some smaller boats, such as [[https://en.wikipedia.org/wiki/Rigid-hulled_inflatable_boat [=RHIB=]s]] (Rigid Hull Inflatable Boat), have dead man cords which are connected to the boat's batteries and the helmsman. Should the helmsman fall overboard, the deadman will detach from the boat and shut down the engines.
* This is the principle of the safety key in most exercise machines, especially treadmills. It's nothing but a magnet attached to a piece of cord that has a clamp on its end for the user to stick to their clothes; the magnet is vital for the circuitry to work, and if it's pulled off (either by the user falling down or distractedly walking away from the machine, the two most common scenarios), the equipment instantly shuts down.
* Websites that you log into that contain sensitive information or are expected to be accessed on public machines will often automatically log out after a period of inactivity to prevent someone from doing something with that account, either by accident or with ill intent.
* UsefulNotes/NorthKorea has a massive amount of Cold War era artillery cannons aimed at Seoul in the event a war breaks out or the ruler is killed. The amount of artillery is enough to completely destroy Seoul, the 2nd largest city in the world with a population of 25 million South Koreans. Of course, the South Koreans and their allies could do ''much worse'' to North Korea if it were to attack first, so it goes both ways.