->''[...] how was a girl from Earth to fully understand? ''h amount of fuel will not power an EDS with a mass of m plus x safely to its destination.'' To him and her brother and parents she was a sweet-faced girl in her teens; to the laws of nature she was x, the unwanted factor in a cold equation. ''
-->-- Tom Godwin, "Literature/TheColdEquations"

A spaceship has been damaged and is AlmostOutOfOxygen (or food or fuel). But then someone calculates that if they had one ''fewer'' crewmember, they just might make it back safely...

Can also apply to circumstances outside of ScienceFiction. Such incidents have even happened in real life, involving sailors in lifeboats running out of food or freeboard. These seldom involved any fine calculations, just desperate people willing to do anything to live a bit longer. Those who travel on spaceships are presumed to be a different breed, or perhaps they're just more educated; therefore expect a LotteryOfDoom, DrawingStraws or HeroicSacrifice.

See also NoPartyLikeADonnerParty and CutTheSafetyRope. A subtrope of SomeoneHasToDie.

Note: Please '''do not include''' discussions on the short story ''Literature/TheColdEquations'' here. Post them on the discussion page for that story.

!!'''As a DeathTrope, all Spoilers will be unmarked ahead. Beware.'''
----
!!Examples:

[[foldercontrol]]

[[folder:Advertising]]
* Played for laughs in a SuperBowlSpecial commercial, where an airplane which has crahsed on a DesertIsland can take off but only if they lighten the load. They have to leave behind the cases and cases of tasty beer cargo. But they manage to TakeAThirdOption by removing the plane's fuselage, so now the beer can come with them.
[[/folder]]

[[folder:Anime & Manga]]
* In the second season of ''Anime/{{Vandread}}'', TheStoic Meia has to take care of Ezra's baby daughter when a space battle breaks out and in the confusion, they accidentally launch in an escape pod. When oxygen begins to run out, Meia has no choice but to [[HeroicSacrifice throw herself out of the airlock]] ([[GoOutWithASmile with a smile, no less]]) to make sure Karu lasts until the pod is picked up by ''[[CoolStarship Nirvana]]''. It turns out, the pod has just been picked up, and Meia didn't notice until she walked out.
* Lampshaded in the ''Anime/MartianSuccessorNadesico'' episode "The Lukewarm 'Cold Equation'", where AntiHero Akito gets stranded without fuel after piloting his HumongousMecha out of range of the CoolStarship, and the two leading contenders in the LoveDodecahedron get stranded with him when their rescue attempts fail due to enemy attacks. Akito ejects the mecha's limbs to get it moving, but the oxygen issue comes up again. Akito finally decides to TakeAThirdOption before they discover that they'd drifted back in range of their starship.
* ''Anime/{{Planetes}}'':
** Subverted, where the exact situation comes up. The testees are placed in a situation where they do not have enough oxygen to outlast the test, either they give up or kill someone to preserve the oxygen they have. Instead, [[TakeAThirdOption they lower the temperature of the room to reduce their metabolism and oxygen consumption.]]
** Also LoveFreak, WideEyedIdealist Ai debating whether to steal a terrorists' air tank to save herself. Ultimately, [[{{BeingGoodSucks}}she is unable to bring herself to steal]] the air tank and begins suffocating. She suffers enough neurological damage from the oxygen-deprivation before they're rescued that she is left in a wheelchair, though it's suggested that she may recover with time and physical therapy.
* The reason for a series of murders in TheKindaichiCaseFiles. The victims are all survivors of a crashed ship, with the same initials. One of them had worked out this equation and pushed a girl off who was trying to climb aboard a full lifeboat; in falling, she managed to grab their keychain with their initials.
[[/folder]]

[[folder:Comic Books]]
* It is alleged that Godwin (author of "Literature/TheColdEquations") essentially took the story from a story published in Creator/ECComics' ''Weird Science'' #13, May-June 1952, called "A Weighty Decision," scripted by Al Feldstein. In that story there are three astronauts who are intended to be on the flight, not one, and the additional passenger, a girl that one of the astronauts has fallen in love with, is trapped aboard by a mistake rather than stowing away. As in The Cold Equations, various measures are proposed but the only one which will not lead to worse disaster is for the unwitting passenger to be jettisoned. Other sources note that the theme of Feldstein's story is itself strikingly similarly to the story "Precedent", published by E.C. Tubb in 1949; in that story, as in the others, a stowaway must be ejected from a spaceship because the fuel aboard is only enough for the planned passengers. These sources argue that neither Feldstein nor Godwin intentionally "swiped" from the stories that came before, but merely produced similar variations on an ancient theme, that of [[HeroicSacrifice an individual being sacrificed so that the rest may survive]].
* In the ''ComicBook/{{Tintin}}'' comic album ''Explorers on the Moon'', when Thompson and Thomson turn up as stowaways on the Moon-Rocket, Calculus worries that, since oxygen supplies were assessed for only four people, there might not be enough for six, and decides to shorten the trip from fourteen to ten days. It gets worse when Colonel Jorgen is revealed to have smuggled himself on board, with the help of TheMole. He intends to maroon Tintin and his companions on the surface of the Moon, pointing out that they don't have enough oxygen to bring prisoners back to Earth. Later when the villains are overpowered, Tintin [[HonorBeforeReason refuses to leave them behind]] despite having exactly the same problem. After Jorgen is killed in a GunStruggle, Wolff decides to atone for his actions [[RedemptionEqualsDeath by stepping out the airlock]]. Even so Tintin and his companions almost don't make it back to Earth.
* ''Rick Random: Space Detective'', a comic of the 1950's. In "Kidnappers from Mars!" SpacePirates get their vessel caught in a '[[SpaceX space]] [[SpaceIsAnOcean tide]]' and realise the only means of escape is the two-man space shuttle. The BigBad and his FemmeFatale girlfriend hide until all the other pirates have killed each other fighting over the shuttle, then take off in it.
* Twisted for a ''{{Xxxenophile}}'' story. The bomb shelter will only hold two, and the female character tells her two male companions that if she has to repopulate the Earth she wants to enjoy herself doing it, so "auditions" are now in order. World War III did ''not'' just break out, she said it had as an excuse for threesome sex.
* Echoed and possibly referenced by Mark Verheiden and Mark A. Nelson's follow-on graphic novel set ten years after ''Film/{{Aliens}}''. Hicks smuggles Newt aboard a weight-critical ("gravity-balanced") ship on its way to the alien homeworld. The situation is averted on this occasion, as he took pains to dump stores equivalent to her weight before takeoff.
[[/folder]]

[[folder:Film]]
* ''Film/WomanInTheMoon'' (1929). After a struggle punctures the oxygen tank, the two male crewmembers [[LotteryOfDoom draw straws]] to see who gets to return to Earth on the rocket. The DirtyCoward gets the short straw and breaks down sobbing, so the hero makes the HeroicSacrifice and stays behind on the Moon instead.
* ''DestinationMoon'' (1950). The rocketship loses reaction mass landing on the moon, so someone has to stay behind even after they've thrown out every piece of equipment they can unbolt. While the {{Science Hero}}es are arguing over who gets to make the HeroicSacrifice, the PluckyComicRelief sneaks outside and laconically tells the others to take off without him. Fortunately someone realises how to dispose of an extra piece of equipment so they can all return safely.
* ''Film/{{Alien}}'' (1979). After the xenomorph does some snacking, there are four crew members left.
-->'''Lambert:''' "I say that we abandon this ship. We get the shuttle and just get the hell out of here; we take our chances and hope that somebody picks us up!"
-->'''Ripley:''' "Lambert, the shuttle won't take four."
-->'''Lambert:''' "Well why don't we [[LotteryOfDoom draw straws]] then--"
-->'''Parker:''' "I'm not drawing any straws. I'm for killing that goddamned thing right now."
* ''Starflight One'' (1983). Disaster movie involving a [[SpacePlane hypersonic passenger plane]] that gets stuck in orbit. Most of the passengers are successfully evacuated and the crew intends to try and achieve reentry, but they're running out of oxygen (the plane is only meant to pass through space for a short time before returning to Earth). A CorruptCorporateExecutive on the ground half-heartedly suggests that if there were three less passengers... The pilot demands this jerk be thrown out of the control room, and he is.
* ''Film/{{Lifepod}}'' (1993), set in an escape pod ejected from a sabotaged spaceship with limited air, food and water. Stating that their odds of survival would increase if one of them dies, a blind passenger tries to cut his wrists. [[spoiler:He's actually the saboteur, and did it knowing the others would stop him.]]
* ''Film/{{Sunshine}}'' (2007).
** Icarus II is damaged on its mission to reignite the sun, but the crew realise they can still get there if one of them dies. A scientist who's lapsed into depression after indirectly causing the death of TheCaptain (and soon the rest of them even more indirectly) is an obvious candidate. All but one of the crew vote to kill him (their mission is, after all, to save the entire human race) only to find he's already killed himself. Or he was killed by a stowaway whose presence makes the whole question moot.
** When there's only one spacesuit to cross back to the Icarus -- the other crewmen immediately start putting Capa (the only man who can fire the bomb) into the suit, ignoring the protests of their commander.
* ''Marooned'' (1969 -- [[HarsherInHindsight made before the Apollo 13 disaster]]). The crew of an Apollo mission is left stranded in Earth orbit with no means to deorbit and a dwindling oxygen supply. Both an emergency rescue mission and a passing cosmonaut eventually help the crew, but not before the mission's commander decides to sacrifice himself.
* This is evoked at one point in ''Red Planet'', and one of the three still-alive crewmen decides to try and reach the old Russian module alone. The second crewman later dies protecting the third one.
* ''TheTransporter'' has one in the opening sequence. Frank is hired to be the wheel man for a bank robbery, with the express and very clear agreement that there will be three men at 254 kilos. The gang shows up with four men. Frank refuses to budge, since he has planned for a very precise amount of fuel to optimally carry three men plus himself and not one smidgen more. The gang's left with the choice of kicking out one man to make weight or sitting still and waiting to be caught. There's nothing tying Frank to the gang, so he's perfectly willing to cool his heels. Finally, the gang leader shoots one of the accomplices and throws his body out, at which point Frank springs into action and proves himself and his ways worth every penny.
* In ''Film/{{Titanic}}'', this is the reason given why the lifeboats don't go back to try to save those in the water after the Titanic sinks: if they go, they'll be mobbed by people trying to get on the boat, causing the lifeboats to sink and killing the passengers aboard them.
* ''Film/AfterTheDark'' is all about debating this trope, when a teacher sets the below-mentioned nuclear bunker scenario to his students.
* In ''Film/{{Interstellar}}'', Cooper does a HeroicSacrifice by detaching himself from the spaceship to ensure Brand's safe onward travel to Edmunds planet. Apparently, resources weren't enough for both of them to survive.
* One of the pub crowd in ''Film/AnAmericanWerewolfInLondon'' tells a joke about a plane full of U.N. representatives who need to lighten the load or they'll crash. Just tossing out the baggage and seats isn't enough, so two of the diplomats jump out heroically ... and the third, a Texan, [[RememberTheAlamo tosses the Mexican diplomat out]].
[[/folder]]

[[folder:Literature]]
* The TropeNamer is of course "Literature/TheColdEquations", the classic 1954 sci-fi short by Tom Godwin famous for averting the AlwaysSaveTheGirl trope. A young girl stows away on a shuttle carrying vital medicine to a planetary colony, not knowing that its fuel has been precisely calculated and her extra weight is enough to cause disaster.
* ArthurCClarke's excellent short story "Breaking Strain" is about a two-man spaceship that (after a micrometeor strike) has only enough oxygen for one of them to survive the trip. It follows one of the characters' thoughts as he becomes more and more tempted to murder his companion and save himself. It has two different {{Adaptation Expansion}}s: the novel ''VenusPrime 1: Breaking Strain'', in which the story's aftermath is investigated, and the film ''Trapped in Space'' (which expands the crew to six people and has a more AndThenThereWereNone kind of plot with successive murders).
* Creator/JackMcDevitt's ''Literature/PriscillaHutchins'' series has a couple of examples:
** In ''The Engines of God'', Hutch is piloting a spaceship which crashes into a BigDumbObject, shutting down their fusion engine. The spaceship starts to lose heat (so much that it starts snowing inside) and the oxygen pumps fail, leaving them with only a week's worth of air in the shuttle and the nearest rescue ship ten days away. A LotteryOfDoom is half-heartedly suggested, but Hutch tells everyone to sleep on it, then sneaks out with the intention of committing suicide (as pilot it's her responsibility to ensure the safety of the others). At the last moment Hutch realises all they have to do is melt the 'snow' (actually frozen atmosphere) to get the needed oxygen. Later on another pilot is looking at his shuttle -- named after a pilot who famously performed a similar sacrifice -- and bemoans the fact that such exciting heroics don't happen now that spaceflight has become routine and safe.
** In ''Chindi'', Hutch is piloting a ship being sent for standby duty at a research station near an unstable star. When she's nearly there, she realizes that the list of Academy personnel on the station includes a teacher, which suggests that the researchers may have their families there--but due to a bureaucratic snafu, her ship is only large enough to carry the listed personnel! At which point, an EM pulse from the star fries everyone's communications systems, and the explosion that caused the pulse looks like it will destroy the station. A number of researchers volunteer to go down with the station, so that others might live, but fortunately, someone back home noticed the snafu, and when communications go out, hurriedly redirects another ship, which arrives just in the nick of time.
* Creator/StanislawLem played with this scenario in ''Moon night''. And an entirely sensible punchline turned it into great BlackComedy.
* The ''Literature/DragonridersOfPern'' story "Rescue Run" had this problem turn up when the rescued colonists try to smuggle in several hundred kilos of precious metals (which turned out to be less valuable than the homemade medicines and seeds they packed legitimately), throwing the mass calculations off. Instead of spacing people, the crew spaces the metal, along with some furniture.
--> ''(bending one of the retrieved platinum plates)'' "Individually, these don't weigh very much, but they damn near coated the ship with them. Ingenious"
* In ''Down To A Sunless Sea'' by David Graham, at one point the narrator's Boeing and his new girlfriend's Antonov are fleeing to Antarctica to escape the nuclear devastation of the entire civilised world. Unfortunately, they run into heavy cloud which is lethally contaminated with fallout, and the Antonov doesn't have the fuel to make the trip at the higher altitude required to clear the fallout. So the Russian co-pilot calls for volunteers and opens the Anti's cargo doors, and leads a procession of about one-third of the passengers on the long drop into oblivion. In some editions of the book, it turns out that they were the lucky ones when all was said and done.
* In Creator/FrederikPohl's ''Literature/{{Gateway}}'', it's one of the many occupational hazards of space travel when all your ships are alien craft with preset trips of unknown length. At least a couple of trips return with nothing aboard but corpses.
* A non-space example shows up in ''The Book of Questions'', a book with scenarios with no clear-cut answer intended to provoke thought. It involves getting trapped in a cave-in with another miner. You have a gun with two bullets and sleeping pills. You know that there is only enough air for one sleeping person to survive for six hours and it's likely to take at least six for the rescuers to reach you. After agreeing to that conclusion, the other miner takes the sleeping pills, hands you the gun, and says it's your decision.
* Subverted in ''Starquake'', the sequel to ''Literature/DragonsEgg''. When the crew of a starship discover they'll be stuck in orbit for six months, with an insufficient food supply, TheSpock of the group calculates that they'll need to kill [[NoPartyLikeADonnerParty and eat]] two crewmembers to survive. Then she points out that [[StrangerInAFamiliarLand they'd never feel at ease again]] among humans if they did, and suggests they FaceDeathWithDignity instead. They are later rescued by the Cheela, who are by then a HigherTechSpecies with few of the Terrans' limitations.
* ''Literature/{{Discworld}}'':
** ''Discworld/{{Snuff}}'' all but invoked the trope name with the concept of the "dreadful algebra" of survival. When faced with lean times, a goblin mother will eat her child. Their religion involves the construction of pots to store certain bodily excretions, and the most precious of these is the jar in which a goblin mother will place the soul of her devoured child, to be reborn when food is more plentiful.
** ''Discworld/{{The Last Hero}}'' references this when the crew aboard a makeshift spaceship note that there isn't as much oxygen as their should be. Food shows up missing, and they briefly theorize that they have picked up an alien intruder, in a shout out to {{Film/Alien}}. Turns out it's the Librarian, who stowed away before takeoff. Luckily, Discworld's moon has breathable air, so they are able to land there and refill.
* ''Literature/{{Oxygen}}'' by John B. Olson and Randall S. Ingermanson. A bomb explodes on a NASA spaceship heading for Mars, leading to the venting of much of their oxygen supply. The crew might survive if all but one of them are placed in a drugged coma. The question is: can you trust that one person who's going to be conscious?
* Subverted in ''Literature/TheSeventhTower'', when Tal accidentally seals himself and Crow into a corner by producing a shield of solid magic to protect them from a spiritshadow. Tal accidentally makes the shield airtight and he can't dispell it. Tal considers killing Crow (and Crow is clearly considering killing Tal) but both decide it was better to to try to wait out the spell than to take the selfish way out.
* In ''Literature/{{Dune}}'' it is Fremen tradition that blind men must leave the tribe go to the desert in self exile, and probably get eaten by a SandWorm. Paul ends up blinded and must do the same to ensure the Fremen would be loyal to his children Leto II and Ghanima.
[[/folder]]

[[folder:Live Action TV]]
* A strange, comedy example from the episode "Real Time" of ''Series/{{Workaholics}}''-the guys are still drunk in the morning, and need to stay drunk rather than get hungover before they arrive at work. Adam runs back to get beers for them, but drinks them all himself (along with a few pulls of whiskey). He meets up with the others, tells them all the beers are gone, and we get this exchange.
-->'''Ders''' What are you talking about? I just saw you drink one right now.
-->'''Adam:''' Yeah, the last one Ders. Think, speak.
-->'''Blake:''' Okay, well, I know we had more than one beer in the house.
-->'''Adam:''' - No, we had four. But there's three of us. And 1 1/2 beers each? That's not enough to get us kablamo-ed. But for one person? that might be enough to take us to the level.
* ''Series/StarTrekEnterprise'' ("Shuttlepod One"). Trip Tucker and Malcolm Reed are stranded on a shuttle, and Tucker decides to throw himself out the airlock to give his companion more time, only to be ordered back at phaser-point by Reed.
* ''Series/StarTrekTheOriginalSeries''
** The episode "The Galileo Seven". When the shuttlecraft Galileo crash lands on a planet, it loses so much fuel that it can't even reach stable orbit unless they lighten their load by 500 lbs. It's immediately pointed out that 500 lbs. is the weight of three men. Two of the crew die while on the planet, and they eventually take off and achieve orbit. Unfortunately they had to use the boosters to do so, so they're guaranteed to burn up on re-entry.
** Another ''Star Trek: TOS'' episode "The Conscience of the King" had this, not in a space ship but on a planet. Kodos "the Executioner", former governor of the Earth colony of Tarsus IV, was responsible for the massacre of over 4000 people, including members of Kirk's family. Governor Kodos had ordered the executions of more than half Tarsus IV's population after the food supply was all but destroyed by a fungus. This would have allowed the rest of the population to survive until relief came. It so happened that the vital resupply ships that could have saved the whole colony arrived much sooner than Kodos had anticipated, rendering all the executions unnecessary. A large part of his infamy came from the fact that he didn't choose randomly or pragmatically, but based on some eugenics formula he had developed. Made worse in hindsight, when it turned out that Hoshi, who was on the first major expedition by humans into deep space, helped develop the Universal Translator and saved Earth from the Xindi, apparently didn't measure up.
* ''Series/StarTrekVoyager''
** In "Deadlock" a NegativeSpaceWedgie creates two ''Voyager'''s occupying the same space. One is damaged in the process, so the captain of that ''Voyager'' decides to destroy her own ship so the other can survive. But hostile aliens board the other ''Voyager'', so that Captain Janeway ends up destroying her ship instead.
** "One" had the ship traversing a deadly nebula with most of the crew in stasis for their safety. Near the end of the trip, the ship's systems start breaking down, and there isn't enough energy to keep the engines running. Seven of Nine has to choose which systems to divert power from, and [[GoMadFromTheIsolation hallucinations of the crew]] mock her for thinking that she could take a few of the stasis pods offline to get the engines running, calling it heartless Borg efficiency. She does so, then [[HeroicSacrifice takes life support offline]] to keep the stasis pods running. Luckily for everyone, the ship exits the nebula in time to for the crew to awaken and save her.
* ''Series/BlakesSeven'' episode "Orbit". AntiHero Avon and DirtyCoward Vila are on a shuttle desperately trying to achieve escape velocity. They throw out everything they can but are short seventy kilos. It turns out that the shuttle is being weighed down by a piece of super-dense matter. Once Avon finds it all he has to do is push it out the airlock - if he can, because it's so damn heavy. Trouble is, he can't get Vila to help him because he's scared Vila into hiding.
-->'''Avon:''' "Not enough, not nearly enough! ''DAMMIT! What weighs 70 kilos?!''"
-->'''Orac:''' "Vila weighs 73 kilos, Avon."
-->'''Avon:''' ''(pulling out a handgun)'' "Vila..."
* In one episode of ''{{Bones}}'' twins had been abducted by The Gravedigger, who buries his victims and demands ransom or they will die in exactly 24 hours (due to suffocation). Except in this case since the Gravedigger didn't expect to abduct two people so they only have 12 hours of air. One was seriously injured and killed himself so the other might be able to hang on a bit longer.
* An episode of ''Series/SpaceAboveAndBeyond'' involved a vast ship with a bunch of survival modules, one of which had to be sacrificed for power. The guy has trouble pushing the button, because ''his younger sister'' is in the one module that isn't full.
* The lifeboat version is mocked in an episode of ''Series/MontyPythonsFlyingCircus''.
* PlayedForLaughs in ''Series/RedDwarf''. Due to the ship exploding, the crew are stuck in a Starbug shuttle, with limited supplies, and neither enough fuel nor oxygen to get to the nearest planet.
-->'''[[ProjectedMan Rimmer]]''': (to [[RobotBuddy Kryten]]) Well, you and I don't use oxygen, do we? So, if we kill [Lister and The Cat] and dump their bodies [[ThrownOutTheAirlock out the airlock]], will that save us enough fuel to get to safety?
-->'''Kryten''': The point is moot, sir, as we only have enough battery power [to run your holographic emitter] for two minutes.
* ''Series/DadsArmy''. Captain Mainwaring is presented with this scenario to test his decision-making skills: You are in a balloon over enemy territory that is slowly running out of air; who do you throw out? Mainwaring claims he would normally throw himself out but he realises he is too important for that. He decides on Godfrey, who doesn't look very happy.
** Wilson then suggests they wait till the balloon reaches the ground then Godfrey [[ComicallyMissingThePoint can step out]].
* In ''Series/{{Lost}}'''s fourth-season finale, as the group of main characters attempts to finally leave the island, Frank notices that the helicopter is running low on fuel, and says they'll have to jettison someone to stay in the air. It initially looks like Hurley will have to jump (judging by his reaction when Frank says this), but Sawyer performs a selfless act by jumping out of the aircraft himself and allowing everyone to escape.
* Subverted in the ''Series/StargateSG1'' episode "Tangent". Instead of killing himself, Teal'c places himself in a ''kel'no'reem'' trance to reduce his oxygen consumption for O'Neill's benefit.
* In ''Series/LegendOfTheSeeker'', Cara and Kahlan both realize that the tomb that they're trapped in doesn't have enough air for both of them. They both give reasons that they should die and the other live - Kahlan that Cara could revive her, and Cara that she's less important to Richard, to whom she's sworn. They even briefly fight to prevent the other from committing suicide - and in doing so, use up the last of their air. [[spoiler: Seconds later, [[BigDamnHeroes Richard and Co]] bust in.]]
* In "The Joining", an episode of the new ''OuterLimits'', a group of scientists are trapped on Venus with limited life support. When there are only two of them left, one kills himself to prolong the other's life.
* On ''MyNameIsEarl'', one of the people on Earl's list happens to be an eccentric old woman (played by Creator/BettyWhite) that the citizens of Camden accused of being a witch. She gleefully traps them in her basement, but she's running out of room, and says she'll have to start killing them. But she's "nice" enough to let them choose who that is. Cue lots of arguing.
* ''Series/{{The 100}}'':
** The Ark has only four months of life support left for its current population, so the option is quickly raised to "reduce" the population to buy time to repair it. This is rejected only because the person with the authority to make such a decision [[EvenEvilHasStandards refuses to kill hundreds of innocent people without a legal reason.]]
** All crimes on the Ark are punishable by death in order to save on life support. The only exception is if the convict is under 18.
* ''Series/BattlestarGalacticaReimagined''. In the webisode series "The Face of the Enemy" Felix Gaeta and a mixed company of humans and Cylons make an emergency jump in their Raptor and (due to a computer error) get stranded far from the fleet. One of the Cylons murders the others (with the exception of Gaeta, her former lover) so they'll have the maximum chance of survival.
* Played for laughs in ''Series/ThirtyRock'': Jack wants to prove that Kenneth isn't really as selfless as everyone thinks, so he fakes a setup where nine people are trapped in an elevator, and tells them all that they have only enough air for eight. Kenneth doesn't even hesitate before he pulls off his own belt and tries to choke himself, much to everyone's horror.

[[/folder]]

[[folder:Music]]
* Referenced in the song "Nautical Disaster" by Music/TheTragicallyHip.
--> I was in a lifeboat designed for ten\\
Ten and only\\
And anything that systematic would get you hated\\
It's not a deal nor a test nor a love of something fated\\
The selection was quick, the crew was picked\\
In an order\\
And those left in the water were kicked off our pantlegs\\
And we headed for home
* Music/SteveTaylor's "Lifeboat". An elementary school teacher leads her class in a thought experiment of being stuck in an overcrowded lifeboat, and asks the students which of the various "undesirables" should be thrown overboard. [[GoneHorriblyRight The kids learn the lesson a little too well]]: applying the message to their current situation, the kids decide the teacher is dead weight and throw her out the classroom window.
[[/folder]]

[[folder:Tabletop Games]]
* ''TabletopGame/{{Paranoia}}'':
** One mission includes a RunningGag with [[ElevatorFailure malfunctioning elevators]] to the 99th floor, one of which is airtight and slo-o-o-ow. Sure, the [=PCs=] ''could'' just use their lasers to ventilate the wall - and face a fine for damaging Computer property - but, this being ''Paranoia'', they're just as likely to instead ventilate the traitors who were using up all the air.
** Another mission gives the [=PCs=] an ever-expanding authority role over a project driving all of Alpha Complex toward mass starvation. Near the end, someone may notice a [[ChekhovsGun politically-discredited but effective device]] that converts [[ImAHumanitarian any organic material]] into food.
---> "Gentlemen, how many citizens does this sector really ''need''?"
* ''TabletopGame/{{Battletech}}'', in the Wars of Reaving Clans Steel Viper, and Star Adder just obtain a great deal of isorla(spoils of war) from fleeing Clan Snow Raven fleet. When they didn't have enough room for all their isorla, they decided to throw out clan civilians out the air lock.
[[/folder]]

[[folder:Video Games]]
* In [[MultipleEndings one ending]] of ''{{Ever 17}}'', Tsugumi and Takeshi find an escape module with which to leave [=LeMU=], but it turns out not to be able to carry both of them to the surface, so one of them ends up having to sacrifice themselves for the other. In case you were morbidly curious as to who self-sacrifices for whom, [[spoiler:Takeshi sacrifices himself so Tsugumi can live.]]
* Played with in ''VisualNovel/NineHoursNinePersonsNineDoors'', in which the nine characters have nine hours to find their way off of a cruise ship. Along the way, they must solve puzzles behind numbered doors, which only three to five people may enter. They may escape when they make it through a door with a nine on it, and some of the characters realize early on that no more than five people can escape. [[spoiler: Later subverted when the ''doors'' with the nines are found, and the protagonist contemplates that the purpose of there being two was to inflict regret upon those who sacrificed members after doing the math. However, this is soon double subverted when, after the two doors, there is another room with a single door with a nine; characters who are left behind after that will still have a chance to escape, but they don't know that when deciding who passes through the door.]]
[[/folder]]

[[folder:Webcomics]]
* ''{{Narbonic}}'' parodies "The Cold Equations" [[http://www.webcomicsnation.com/shaenongarrity/narbonic/series.php?view=archive&chapter=10009 here]]; when the pilot is [[NonActionGuy Dave]] and the cute stowaway is [[PsychoForHire Mell]], it's not the stowaway who's going out the airlock.
* ''Webcomic/QuentynQuinnSpaceRanger'' devotes an entire arc to tearing into the trope namer. According to the author only an over-regulated state monopoly would ever use death traps like the shuttle in the original story.
[[/folder]]

[[folder:Western Animation]]
* In an episode of ''{{Futurama}}'', this occurs when the [[RecycledINSPACE Space Titanic]] is sinking into a black hole. The main characters board an escape pod, but the extra weight of Bender's GirlOfTheWeek is causing the escape pod to drift towards the black hole, [[HeroicSacrifice so she willingly lets go]], saving the other characters. She is, of course, killed by falling into the black hole, and is never heard from ([[ForgottenFallenFriend or even mentioned]]) again.
* The nuclear shelter scenario is spoofed in ''TheSimpsons'' episode "Bart's Comet". A comet is about to strike Springfield and so the entire towns' population tries to cram into Ned Flander's bomb shelter. They somehow manage this, but can't get the door closed. After arguing about who should be sacrificed Homer points out that the one skill future society doesn't need is the ability to sell left-handed products, so Ned gets thrown out of his own shelter. Eventually they all feel guilty about this decision, so leave the shelter to die with him. The comet ends up striking the bomb shelter and destroying it.
* This crops up in ''TransformersTheMovie'', with the Decepticons (who are retreating from a battle on Earth back to Cybertron) finding out that there's not enough fuel to make the voyage with the current amount of weight on the shuttle. Starscream (of course!) suggests airlocking the wounded Decepticons so the healthy ones will survive. Surprisingly, the Decepticons put it to a vote; the wounded Decepticons vote against the idea, the uninjured ones vote for it. Since the uninjured outnumber the wounded, out the airlock they go. Given that Transformers can [[BatmanCanBreatheInSpace breathe in space]] and that there were plenty of other planets closer than Cybertron around, it's pretty clear they could have easily [[TakeAThirdOption Taken A Third Option]] if they were really inclined. Starscream just wanted to finally get rid of Megatron, who was one of the wounded. That, and Decepticons are dicks.
* In the first episode of ''WesternAnimation/TheMightyDucks'', the Ducks' ship is traveling through dimensional limbo. Unfortunately, the ship will fall apart unless some weight is jettisoned, and everything onboard is bolted down. Team leader Canard decides to jettison ''himself''. Wildwing tries to stop him, but only manages to save the mask of Drake Dukane.
[[/folder]]

[[folder:Other]]
* That scenario that was supposed to test 'decision making' but was actually a SpaceWhaleAesop regarding the evils of nuclear proliferation. You know the one: there's six people but only room in the nuke shelter for five -- whom do you throw out? There would usually be an obvious RedShirt character like a priest, supposedly proving the irrelevance of organised religion. These scenarios never included the details that would matter in real life, such as who was your best buddy, who was an attractive member of the opposite sex or who was holding a firearm at the moment the crucial decision was made. It also doesn't factor in ValuesDissonance. A Catholic might well decide that having a priest is far more important than having a doctor, for instance. In the end, the resulting argument is intended to make everyone conclude that [[SpaceWhaleAesop nuclear war is wrong]] as TakeAThirdOption.
* There's an urban myth where people found the dead body of a man in the desert holding a piece of straw. In a line from his body are clothes and equipment. It's impossible for him to have walked and there are no tracks leading away from a vehicle. The solution to the mystery is that he was on a balloon that was descending over the desert; the passengers threw out everything they could to gain height, before realizing one person would have to go. The corpse drew the short straw.
* Another scenario meant to teach [[StockAesop to never judge a book by the cover]] uses this, and runs thusly: You are in a balloon that is rapidly losing height at a rate than any impact will prove fatal for all aboard. The passengers are you, a geriatric old woman, a wealthy looking man in a [[SharpDressedMan suit]], and a teenager about to inject himself. One person must be thrown out, but who? Turns out the old woman fought for women's rights, the businessman earns hundreds of dollars through fraud, and the teenager's actually injecting himself with insulin--he's diabetic.
* Oddly enough, none of the options ever seem to be "HeroicSacrifice..."
[[/folder]]

[[folder:Real Life]]
* [[http://en.wikipedia.org/wiki/Apollo_13 Apollo 13]] actually ran into this dilemma. After the oxygen tank in the command module explodes, the crew is forced to use the life-support systems of the LEM module. Normally, this wouldn't have been a problem, but the LEM was only designed to support two people, not the full crew. [[note]]In an ordinary mission, two crew members would land on the moon in the LEM and explore the surface while the third stayed on the command module in lunar orbit.[[/note]] Luckily, they succeeded in MacGyvering a few ways to work around this that didn't involve murder, and NASA wanted their [=LEMs=] to have a big fat margin of error if something went awry. NASA didn't expect the LEM to have to last for 3 men for the entire mission, but it did.
* Two famous court cases in UsefulNotes/TheCommonLaw tradition involving survivors of shipwrecks who took to the lifeboats and were charged with murder for their subsequent actions. Both cases ended with the accused being charged of murder (albeit with vastly reduced sentences), setting the precedence that self-preservation does not excuse the murder of an innocent.
** ''[[http://en.wikipedia.org/wiki/William_Brown_(ship) United States vs. Holmes]]'' (a [[CaptainObvious US federal case]]) in which sailors forced passengers (including women) off an overcrowded lifeboat.
** ''[[http://en.wikipedia.org/wiki/R_v_Dudley_and_Stephens R vs. Dudley and Stephens]]'' (a British case 40 years later that cited ''Holmes'') in which sailors [[NoPartyLikeADonnerParty murdered and ate]] the weakest member of their lifeboat crew, on the grounds that they were starving and he was likely to die anyway.
** Precedent does, however, establish that necessity is a positive defense to cannibalizing a corpse provided that the victim was already dead.
* Lawrence Oates went out into a blizzard after supplies for the ill-fated [[http://en.wikipedia.org/wiki/Terra_Nova_Expedition Scott Antarctic Expedition]] ran low, in an ultimately futile attempt to save his companions.
-->"[[FacingTheBulletsOneLiner I am just going outside and I may be some time]]."
* The commander of a UsefulNotes/ColdWar-era underground base in North Bay, Ontario would have been forced to invoke this had a nuclear bomb detonated near the base and forced it to be sealed. To prevent radiological contamination, the entire base's air supply would be sealed. ''[[DidntThinkThisThrough Even the air-supply for the emergency generators!]]'' They had a choice: [[SadisticChoice keep the generators running so that the base's air defense computers kept running, and kill everyone within hours, or keep them off, survive for weeks, but weaken the defenses of a continent?]]
** [[CaptainObvious Luckily, this never happened.]]
[[/folder]]
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