History Main / ChekhovsClassroom

21st Mar '15 2:08:24 AM eroock
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-->--''{{Creator/Hiimdaisy}}'', ''[[VideoGame/MetalGearSolid3SnakeEater Let's Destroy the Shagohod!]]''

to:

-->--''{{Creator/Hiimdaisy}}'', -->-- ''{{Creator/Hiimdaisy}}'', ''[[VideoGame/MetalGearSolid3SnakeEater Let's Destroy the Shagohod!]]''
11th Mar '15 3:20:45 PM V2Blast
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->'''Boss:''' Jack, you need to know what it means to be a solider. Today's friends might be tomorrow's enemies. Like next week, when you'll have to kill ''me.''\\

to:

->'''Boss:''' Jack, you need to know what it means to be a solider.soldier. Today's friends might be tomorrow's enemies. Like next week, when you'll have to kill ''me.''\\
21st Feb '15 1:40:00 PM johnnyfog
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-->''Pay attention in class, especially science class, because you will need the information later in the episode.''

to:

-->''Pay ->'''Boss:''' Jack, you need to know what it means to be a solider. Today's friends might be tomorrow's enemies. Like next week, when you'll have to kill ''me.''\\
'''Snake:''' '''''WHAT.'''''
-->--''{{Creator/Hiimdaisy}}'', ''[[VideoGame/MetalGearSolid3SnakeEater Let's Destroy the Shagohod!]]''

''Pay
attention in class, especially science class, because you will need the information later in the episode.''
20th Jul '14 11:54:37 AM TheOneWhoTropes
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* ChekhovsClassroom/{{Live-Action Films}}

to:

* ChekhovsClassroom/{{Live-Action ChekhovsClassroom/{{Live Action Films}}



* ChekhovsClassroom/{{Live-Action TV}}

to:

* ChekhovsClassroom/{{Live-Action ChekhovsClassroom/{{Live Action TV}}
30th May '13 9:15:22 PM allboyband
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''Pay attention in class, especially science class, because you will need the information later in the episode.''

to:

''Pay -->''Pay attention in class, especially science class, because you will need the information later in the episode.''
8th Dec '12 10:27:05 AM CaveCat
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[[foldercontrol]]

[[folder:Anime & Manga]]
* In the HotSpringsEpisode of ''Anime/NeonGenesisEvangelion'', they use precisely this grating dialogue when they destroy an angel with the help of thermal expansion, which by amazing coincidence, Shinji had been studying that very day.
** Worth it for the line "[[DoubleEntendre Thermal expansion... how embarrassing]]", though.
*** The example used by Asuka was pretty sweet, too.
* Episode 3 of ''Anime/NightWizard'' featured [[RagnarokProofing a millenia-old puzzle]] about the color of a burning metal's flame guarding a CosmicKeystone. No points for guessing what the lecture earlier on in the episode was about.
* Done rather effectively in ''LightNovel/FullMetalPanic! The Second Raid'', where during a mission briefing one of the SRT members makes a joke about [[spoiler: the Cretans Paradox. When the commanding officers realize that [[TheMole a mole]] is relaying their communications to the enemy, they manage to turn the tables by obliquely referencing the joke, which lets the field teams know to do the exact opposite of what they're ordered thereafter.]]
* An episode of ''Anime/TransformersVictory'' had an early scene of Wingraver and Dashtacker teaching Jean about levers. Sure enough, later in the episode, he came up with a plan to use a lever to free a trapped human.
* Kakashi's lecture about revenge before the Sasuke retrieval arc of ''Manga/{{Naruto}}''. Guess what becomes one of the central themes of the manga (and not just to Sasuke)?
** During Naruto's Rasenshuriken training, he finally nails it after asking Kakashi how to "look towards right and left at the same time", whereupon Kakashi creates a shadow clone, inspiring Naruto to use shadow clones to do two things at once. The same phrase uttered word-for-word by Fukusaku later during his Sage Mode training gives him the idea to overcome his obstacle, again by using Shadow Clones.
* Doesn't exactly help the protagonist solve anything, but a plot point is explained this way in ''Manga/TheVisionOfEscaflowne''. Specifically, a class lecture drops off the random tidbit that [[spoiler:Isaac Newtown studied gravity blah blah but also in a metaphysical sense]]. Meanwhile the main villain [[spoiler:is revealed to be from Earth, for his true first name to be Isaac, and has created a ton of powerful inventions for Zaibach, including technobabble about the gravity of hearts and such]]. Hmmmmmmmmm.
* Gon in ''Manga/HunterXHunter'' escapes from a powerful enemy by remembering a lecture on how to swindle [[CrackIsCheaper antiquarians]].
* In ''Manga/PokemonSpecial'', Pearl is told by the Fan Club President that in order to prepare for Platinum's first Super Contest performance, each member of the Sinnoh Trio must do one different part. Much later on in the story, when everyone is freaking out over the revelation that Team Galactic is planning to blow up the three lakes, Pearl notices the ribbon that Platinum's Empoleon won and remembers the President's words. He then declares that each of them must go to and protect one different lake, marking the first time in their journey together that the three of them would have to travel alone.
* ''Anime/{{Pokemon}}'': the actual lecture is not shown on-screen, but the only reason Ash et. al could get out safely from the S.S. Anne disaster is that Misty studied the ship's layout for a class project.
[[/folder]]

[[folder:Films -- Live Action]]
* Indiana Jones and The Last Crusade. Indi mentions in class that there is no buried treasure and X "never marks the spot" Later in the film he discovers that the path to the Tablet is under the a number ten, which turns out to be the Roman numeral X, so X marks the spot.
* The titular character of {{Fresh}}, while suffering a HeroicBSOD after his would-be girlfriend was killed in when an AxCrazy gangster shot up the playground when he was losing at basketball, gets berated by his [[SamuelLJackson father]] who only notices [[WellDoneSonGuy how poor his son's chess game is]]. Still, the [[ChessMotifs chess lessons on the importance of exploiting your opponents character and sacrificing any game piece if it means winning]] come in quite handy [[spoiler: when Fresh enacts his plan to escape his neighbourhood by maniuplating the gangsters to kill each other, then turning in the survivors to the police and applying for witness protection,]] while relying on the fact that he is JustAKid to stay BeneathSuspicion.
* Variation occurs in ''Film/MontyPythonAndTheHolyGrail'': at the beginning, a castle guard gets distracted by King Arthur's "[[TheCoconutEffect coconut horse]]" and goes into great length talking about whether swallows could carry coconuts into England. Toward the end of the film, the Bridgekeeper asks, "What is the air-speed velocity of an unladen swallow?" Arthur remembers a detail discussed by the original guard and asks, "What do you mean? An African or European swallow?" which causes the Bridgekeeper to fall into his own trap. In the original ending, which was cut at the last minute, the English army was saved by sparrows dropping coconuts on the French.
* ''SlumdogMillionaire'' uses a justified version of this trope to great effect. The entire plot is centered on the protagonist explaining episodes in his life that have given him unexpectedly useful knowledge.
* In ''{{Shorts}}'', Helvetica does her science projects on female wasps and their habit of "male-stuffing". Later on, [[spoiler:in the fight against Giant Mecha Mr. Black, Helvetica uses the rainbow wishing rock to wish that she were a giant wasp... ''male-stuffing''.]]
* ''TheDevilsBackbone'' has a borderline example: in one scene, the boys are in class learning about prehistoric man, and Carmen shows them a picture of hunters taking down a mammoth as a group. The image is invoked at the end, when the boys [[spoiler:bring down Jacinto by stabbing the crap out of him with sharpened sticks, before shoving him into the well for [[UndeadChild Santi]].]]
* [[DrivesLikeCrazy Elwood Blues]] goes on one of these lectures to his brother in ''TheBluesBrothers'' on the benefits of a cop car: cop shocks, engine, suspension, etc. This comes in handy with the utter vehicular chaos that ensues.
* ''Film/StarshipTroopers'' has [[DrillSergeantNasty Sergeant Zim]] demonstrate the importance of combat knives despite it being a '[[NukeEm nuke fight]]', citing, "The enemy cannot push a button, if you disable his hand!" This comes in handy later when Carmen [[spoiler:cuts off the [[HiveMind Brain Bug's]] brain-sucking proboscis with a concealed combat knife.]] Interestingly enough, she wasn't actually at that lecture, being a fleet pilot, and all.
** Worth noting, she ''was'' at the lab class where they disected bugs, causing her VomitIndiscretionShot. She seemed to get the hang of using a knife on bugs later on, didn't she?
** An {{Anvilicious}} non-science version also happens with Raczak's high school lecture about the difference between a Civilian and a Citizen. Rico, Carmen and Dizzy are present for that scene early on, and just before the film's final act, the three are together again, where Rico [[MeaningfulEcho talks about the difference between a Civilian and a Citizen]] [[spoiler: while he and Carmen attend Dizzy's funeral. A Citizen is willing and prepared to sacrifice themself for the good of society, while a Civilian is not.]]
* In ''[[Literature/{{Twilight}} Eclipse]]'', Jacob's family tells a story about how a woman helped distract a vampire by cutting herself, which Bella does in the final battle. Also, Jasper warns everyone not to let a vampire grab you under any circumstances. [[spoiler: Jacob forgets this and is nearly broken in half with a BearHug]].
* The first ''Film/JurassicPark'' sees paleontologist Dr Alan Grant scare a poor child with detailed information about the velociraptor pack mentality and how they tend to eat their prey.
* In ''{{Copycat}}'', Sigourney Weaver's character gives a lecture on serial killers and at one point asks all the men in the audience to stand. Several of the men's faces are then projected on the screen behind her as she explains that men are more likely to be serial killers, and how they look just like everybody else. Naturally, the movie's villain (a serial killer himself) is one of the men projected on the screen.
* ''King Ralph'' could practically be the naming of this trope. At the end, when Ralph is looking for a way out, he tells an aide that he usually ignores what the aide says, that aide once said, 'I think we made the right choice'. Ralph remembers that and asks who the other candidate is, and the denouement begins.
* In ''Film/MeanGirls'' Cady uses this to win the [[PunnyName Mathletes]] competition. She harks back to an old maths class to answer a question about limits.
* ''{{Timeline}}'' begins with a history lesson the the archeologists. They go back in time and need to use exactly what they just learned.
* ''Film/BlackDeath'' has the method of mercy-killing.
* ''Jett Jackson: The Movie'', the made-for-TV movie of ''TheFamousJettJackson'': After Jett and his TV character Silverstone [[TrappedInTVLand have switched places in each other's universes]] and have been living in each other's shoes for a while, Jett's grandmother later approaches Silverstone in a quiet moment, where it's revealed that she'd already figured out he wasn't her grandson. When Silverstone asks how she knew, she explains that when Jett was born, she looked him in the eyes and knew that from thenceforth she'd always be able to know and identify him. [[spoiler:In the climax of the film, the shape-shifting BigBad in Silverstone's world makes himself look like Jett, causing a doppleganger problem when the three confront one another; Jett and Silverstone look each other in the eye and know they're both the real deal]].
* {{Pirates of the Caribbean}}. In the first movie, Will frees Jack from prison using a bank as a lever on the prison door. In the third movie, when Jack is captured by Davie Jones, guess what he does to the prison door?
* In the DVD extras of ''X-Men'', the young mutants are learning about ancient Rome. Rome started out persecuting Christians, and then wound up becoming a Christian empire. How did this happen? "The Emperor became a Christian!" Which is exactly [[spoiler: what Magneto had in mind with his plan to turn all the world leaders into mutants.]]
[[/folder]]

[[folder:Literature]]
* Hermione constantly saves the day in ''Literature/HarryPotter'' because she was the only one paying attention in class when the relevant magic was discussed.
** This sort of thing is even done across ''books''. In the fourth book, Dumbledore casually mentions a room filled with chamber pots that he found when he desperately needed a bathroom, and then was unable to ever find again. In book 5, the room is formally introduced as the Room of Requirement, and ends up being an integral part of the story in every remaining book in the series.
*** And in the very first book, Snape quizzes Harry, and one of the questions is about bezoars. In book six, it's used to save Ron's life, although Harry re-learns about it from Snape in a roundabout way.
** [[RunningGag "Has]] ''[[RunningGag no-one]]'' read [[{{Doorstopper}} "Hogwarts: A History"]]?
* In DanBrown's ''AngelsAndDemons'', an early discussion of how much a small flat object can slow down a falling person saves Robert Langdon's life when he uses a window cover to slow his fall from an exploded helicopter. This is also lampshaded at the time the discussion takes place.
-->''[[LittleDidIKnow Little did Langdon know]] this information would save his life in a matter of hours.''
* Modern pulp author MatthewReilly uses this to a ''ridiculous'' degree. Two examples:
** In ''{{Temple}}'', there's a throwaway sentence from the protagonist about how he'll need to change his PIN number after reading a story in the paper about how most people use their birth dates as pass codes. Guess how he defuses the superweapon his brother worked on?
*** Guess again, it wasn't his birthday. But that example was used as a starting point. [[spoiler:His brother always used Elvis' army serial number as his PIN. The {{Nazi}} scientist used his supposed date of execution.]]
** In ''{{Area 7}}'', a precocious youth found in the middle of a government base delivers a buttload of the kind of trivia kids that age accumulate and share at any opportunity, including how komodo dragons are sensitive to changes in the Earth's magnetic field. So there's a scene where the main character has to fight off ''komodo dragons'' in a watery pit with his magnetic grappling hook.
* Subverted and lampshaded in ''TheHitchhikersGuideToTheGalaxy''.
-->Arthur: You know, it's times like this I wish I'd listened to my mother.
-->Ford: Why, what did she say?
-->Arthur: I don't know, I wasn't listening!
* In the Strange Matter book 'Knightmare', the protagonist remembers a comic his friend told him about in where crossbow being the only weapon to pierce the bad guy's armor. He later uses a crossbow to evil the pierce the evil knight's armor and kill him.
* An opening scene of ''Literature/GalaxyOfFear: Eaten Alive'' has a zoology lesson mentioning how the fearsome rancor, which usually kills anything it sees... except for the tiny gibbit birds which venture into its mouth to clean its teeth. The characters end up on the planet [[IDontLikeTheSoundOfThatPlace D'vouran]], [[spoiler: which is a carnivorous entity that will slowly eat any beings on its surface except for the native Enzeen, who make people want to stay there.]]
** In ''The Nightmare Machine'', Lando teaches Zak how to play cards, and that "A good rule to follow is that if the other guy is acting normal under unusual circumstances, you can bet he's bluffing." Ultimately that's how he knows he's in [[spoiler: an illusion]] later.
** ''The Doomsday Ship'' has Tash finding a bit of Jedi lore about how sometimes it's better to take "action through inaction", or that waiting is sometimes a valid response. She shows it to her brother. After that, Zak finds his uncle playing dejarik on the computer and taking his time despite an icon on the screen flashing "YOUR MOVE". Uncle Hoole says sometimes the computer has to wait, he's strategizing. This is important later.
[[/folder]]

[[folder:Live Action TV]]
* Even ''Series/BuffyTheVampireSlayer'' isn't above using this trope at least once. In order to defeat the evil science teacher who is actually a giant praying mantis, Buffy uses the recorded sound of bat sonar to "make [her] nervous system go kerplooey". She learnt about that in science class earlier in the episode (though, thankfully, from the previous science teacher. No villain should be stupid enough to teach a class their own weaknesses).
** That's not how she ultimately kills the praying mantis. She does that with a big machete.
*** It's Buffy, after all.
* ''Series/DoctorWho'' used to do this on several occasions, partly due to originally being conceived of as an edutainment program. For example, in the early story "Marco Polo" the condensation of water was a key plot point, while in "Planet of Giants", that pressurised cans explode when heated was another point. The Daleks were originally defeated due to elementary knowledge of electrical conductivity. The same technique was used to teach history in its early historical stories. Though most of the explanations happened in the course of events, not given out only to later be recalled.
* Every episode of ''BlackHoleHigh'' (a.k.a. ''Strange Days at Blake Holsey High'') featured this. Apparently, the unpredictable wormhole at least had the good manners to follow the [[strike:state]] [[CanadaEh provincial]]-mandated science syllabus exactly.
** Given the way physics works at Blake Holsey (namely, that its laws will bend to teach you an Important Moral Lesson), it is entirely possible that the wormhole was doing it "on purpose", and the physics lectures or experiments in act 1 were really shaping the physics weirdness in act 2.
** Or the time traveller could have done his history research and made sure the syllabus matched.
* A lovely children's education show called ''Series/{{Storylords}}'' entirely revolved around this. Somehow, Mrs Framish the reading teacher, always had either covered the necessary reading skill that day, or taught it the next day, in plenty of time for our hero to use it to defeat Thorzuul.
* Subverted in ''StargateAtlantis'', when Sheppard finds himself in an F-302 latched onto a Wraith Hiveship in hyperspace. He flashes back to a memory of [=McKay=] and Zelenka arguing about whether a non-hyperspace capable ship could detach from another one while in hyperspace without being destroyed, which is exactly what Sheppard needs to know. Then they ask Sheppard what he thinks, but he's not paying attention because he's flirting with the woman at the next table. He ends up not taking the risk, and has to wait for the Hiveship to leave hyperspace.
* Crossed with IKnowYouKnowIKnow in the [[http://www.youtube.com/watch?v=JcVAcxayiFM 'Fingers and Fumbs']] episode of ''{{QI}}'', where host Stephen offers the contestants an opportunity to go double or nothing on a forfeit by playing RockPaperScissors with him. He mentions that, psychologically, people tend to pick scissors first, because it's commonly believed that others would play rock first, and so would play paper to counter it. Phil and Dara both tie with him on scissors the first three times it happens (Phil having played twice). The fourth time, however, [[spoiler:Phil exchanges an obvious glance with Alan, and psyches Stephen into playing paper while he plays scissors. Dara and Alan also get to defeat Stephen, both using rock while Stephen kept using scissors.]]
* ''{{Glee}}'': "Hermaphrodite Nazi Sympathizers."
* The third episode of BBC's 2010 ''Series/{{Sherlock}}'' had Holmes fighting an assassin in a planetarium while an astronomy lecture played in the background. Wouldn't ya know, the lecture contained a clue that helped Holmes identify a painting as a fake and solve Moriarty's fourth challenge.
* [[ExploitedTrope Exploited]] by the crew on ''{{Leverage}}''. While setting up a con on a college student, Nate plays a professor who antagonizes the mark so that Hardison can make friends with him. The lecture Nate gives is about the prisoner's dilemma problem in game theory, and he tells the class that it's always better for the prisoners to turn on each other. Later, they put the mark in a situation where he has the option of turning on his confederates, and he flashes back to Nate's lecture and decides to do it.
** In real game theory, it's better to cooperate.
[[/folder]]

[[folder:Video Games]]
* The ''VideoGame/{{Persona}}'' series:
** Sort of used in ''VideoGame/{{Persona 3}}'': [[spoiler: a teacher obsessed with magic explains the significance of the major arcana of the tarot about halfway through the game. This becomes at least marginally important when the Final Boss states that Death, the 13th arcana, represents the end. However, as the teacher explained way back when, Death is merely a change, not the end, and there are another 8 major arcana after Death, which allows the protagonist to use the ''true'' final arcana, The World, to defeat the BigBad.]]
** Used in a similar manner in ''VideoGame/{{Persona 4}}'', [[spoiler:by the same teacher no less. While on a trip to the high school from ''VideoGame/{{Persona 3}}'', he tells you the story of Izanagi and Izanami. Which explains the motivation behind the final boss and how you beat her in the end.]]
* ''VideoGame/KingdomHearts358DaysOver2'' has a kernel of wisdom, courtesy of Xaldin--he warns that the bridge to the Beast's Castle is the only point of access, so if a powerful enemy were to attack the area it'd come from there. Both foreshadows the appearance of such a boss later in the same game, and is a CallForward to ''VideoGame/KingdomHeartsII'' where Xaldin engages you on the bridge.
** In ''Birth By Sleep'' Eraqus tells Aqua classified information only Keyblade Masters are allowed to know, but this knowledge isn't revealed to the player [[spoiler:until the Final Episode where a flashback reveals Eraqus told her how to protect the Land of Departure by turning it into Castle Oblivion]].
* It gets glossed over early on in ''[[LegacyOfKain Soul Reaver]]'' that vampires are vulnerable to certain sound frequencies, but this doesn't serve much purpose except for a sound-based attack spell and a non-canonical deleted ending. Then three games later ''Defiance'' pits us against [[spoiler:Turel]], a vampire with SuperSenses who can only be harmed by ringing a series of giant gongs.
* Present in the Fate route of [[VisualNovel/FateStayNight Fate/Stay Night]], as [[StealthMentor Archer]] decides to give a few hints about his magic to Shirou, with plenty of [[DeadpanSnarker sarcasm and veiled threats thrown in.]] Our hero later uses all of the information gained [[spoiler: to project Caliburn and defeat Berserker]].
--> '''Shirou:''' ''"It wasn't his usual harassment. Those words held an importance that I need to understand right now. -- No, saying that... [[IdiotHero Weren't all of his words a warning that I shouldn't have ignored?]]''"
* In the first year of GrimFandango, the janitor demon lectures you that spraying the fire extinguisher on the packing foam causes an explosion. You use this information later on in the fourth year, where [[spoiler: you use it to build a rocket to save Glottis]].
* Used in [[HalfLife Half-Life 2 Episode 2]]: At White Forest, a rebel is teaching others about the effectiveness of an AR2 Combine ball against hunters, a while before [[spoiler:the White Forest rocket is attacked by hunters and striders]].
* In ''[[SpaceQuest Space Quest V]]'' you begin the game by passing a test that gives ridiculous answers to questions like "how to best defeat an android bounty hunter" -- [[spoiler:"drop a rock on him"]]. Several of those turn out to be answers to in-game puzzles.
* In ''VisualNovel/DanganRonpa: The Academy of Hope and the High School Students of Despair'', several days end with Monokuma holding a short "Monokuma Theatre" segment. While these can sound quite random (especially as he enjoys reminding everyone that [[EverythingsWorseWithBears he's a bear]]), sometimes they foreshadow future events.
* In the first AceAttorney game, [[spoiler:von Karma patronizingly lectures Phoenix about PIN numbers. He even uses his own number as an example. Sure enough, it's needed later. Of course, giving out your PIN number in open court is both incredibly arrogant and entirely in-character.]]
[[/folder]]

[[folder:Web Original]]
* In the WhateleyUniverse story "Ayla and the Tests", Phase misses several days of school and gets a big lecture in the lab section for Powers Theory class from Dr. Yablonski on Warper powers and warp displacement fields of 'giants' (Warpers who use their power to apparently grow to huge size). In a LampshadeHanging, Phase even refers to him as MisterExposition. Guess what Phase faces when they go to Boston? A forty-foot giant who's a warper.
** In "Ayla and the Birthday Brawl", Ayla shows (s)he knows too much about taking out mutants with powers, and she talks all about it on the way back from martial arts class. What she says about fighting Package Deal Psychics saves Lancer's life in the big final fight.
* The [[KidHero students]] at the [[GlobalGuardiansPBEMUniverse Hyperion Academy]] used the information they learned in about electro-magnetism during their weekly physics class to defeat the villainous Lodestone.
* {{Lampshaded}} in AVeryPotterMusical: at the beginning, Snape asks if anyone knows what a Portkey is. His next question is if anyone knows what {{Foreshadowing}} is.
[[/folder]]

[[folder:Western Animation]]
* Generally averted in ''WesternAnimation/CodeLyoko''. Though some classes at the start of an episode may have a coincidental link to future events (for example, a lecture about nuclear energy production happening just before XANA attacks a nuclear power plant...), the specific content of the lecture would hardly be of any help for the heroes, since Jérémie and Aelita know probably more than the teachers already. At best it will be mentioned as a joking aside. If the class directly influences the events, it's usually because it gives Jérémie an idea that he next tries out -- like the biology class about ants that prompts him to create the "Marabounta".
* Parodied in the ''WesternAnimation/AmericanDad'' episode "Stan's Night Out". Stan watches a television show about gardening, where the host says that you can start a lawnmover with the first pull, if you stand on the back wheels. Later, when he's trapped by a ruthless crime lord in a shed, he sees a lawnmover, and proposes a wager; if he can start it ten times in a row, the bad guy will let him go. So, he stands on the wheels, pulls the rope... and the lawnmover doesn't start.
* In what has to be a spoof, an episode of ''KimPossible'' has Ron tutoring Kim in Home Economics. Later on, Kim uses Ron's advice when Shego has her trapped in a giant industrial mixer. While facing certain death from the large mixer blades, Kim Possible grabs the mixers, stays/spins with it, follows it up into the air, lets go of it and defeats Shego by doing a jump kick that screws with the laws of physics. All thanks to a lesson about cooking where Ron says to her how she shouldn't fear the mixer but instead be one with it.
** In a later episode, ExecutiveMeddling forced them to have a lecture about good nutrition and the five food groups. Ron falls into a vat of the Titan Formula and becomes a junk-food-eating-monster. Luckily Kim and her brothers know the cure for that!
*** And to drive home the fact that they had to make this episode, Ron gives a AndKnowingIsHalfTheBattle by warning kids [[SpoofAesop not to fall into vats of experimental super growth formula.]]
* In ''TheMagicSchoolBus'', usually the dangerous situation is the lecture, or an extension of it, and the resolution always conveniently requires them to recap everything they've learned that day. Arguably justified as intentional on Ms. Frizzle's part as an aspect of her teaching style.
* Normally subverted in ''MightyMax'' whenever Max comes up with a clever plan to save the day. It's usually not until ''after'' the villain is defeated that Max gives the Chekhov's Lecture, either to the other characters or directly to the audience in the {{Edutainment}} sections at the end of each episode.
* Referenced on ''TheSimpsons'' when a tipped salt silo from the local cracker factory melts all the snow surrounding the school and Martin tastes it and declares that it melted with "a little help from our friend Sodium Chloride!" [[RunningGag He then gets punched in the gut by Nelson.]]
** Another episode has Bart rush out of a class on Roman numerals to steal the town's lemon tree back from Shelbyville. Later on in the same episode he ends up in a room with a choice of doors labelled I-X and a piece of paper that claims that the seventh door is the exit and all the others contain man eating tigers. In a subversion, he doesn't even remember the class but makes the right choice anyway thanks to his knowledge of ''Film/{{Rocky}}'' films.
** And in case you're wondering, the film in question Bart comes up with? [[spoiler: [[NumberedSequels ''Rocky VII:'']][[OddlyNamedSequel '''Adrian's Revenge''']].]]
* The Phantom of ''FlyingRhinoJuniorHigh'' frequently transforms the school into a death trap based on whatever lecture (or sometimes just topic of discussion in general) the children were having that day. This naturally leads to the students who were paying attention being the ones to get everyone out of trouble.
* ZigZagged in ''WesternAnimation/WinxClub'': Most of the time class lessons seen on the show are not immediately applied, usually because they're basic spells or magical theory. However, a few lessons, like the Plasma Sphere for Tecna and convergence magic for the whole group, are taught and then used that episode or a few episodes later.
* ''TotalDramaWorldTour'' has Sierra mentioning that Cody's birthday is April 1 during the first episode. In ''Aww, Drumheller'', [[spoiler: she makes a cake to celebrate his birthday, which both warms him up to her (because last year his birthday was ignored) and also got her kicked off when the "candles" made the plane explode.]]
* Parodied in MegasXLR, when Coop has sudden flashback to his high school science teacher scholding him for not paying attention and saying that one day he might need her lesson. She was right, as what she was talking about happens to be contain informations about [[MonsterOfTheWeek bad guy's of the week]] main super weapon and Coop really doesn't remember them.
* In one episode of ''WesternAnimation/TheMummy'' animated series, Alex manages to avoid being crushed by falling ruins, commenting on his recent geometry lesson really came in handy.
* Inverted and parodied in ''MaxSteel'':
** Inversion: Josh is required to write an essay on the Cold War with a fresh angle. A mission he goes on later that day requires him to go through escape tunnels in Washington D.C. (something vaguely mentioned in the lecture), and he uses that knowledge to get an A+ on his essay.
** Parody:
--->'''Max:''' How come we never have a mission to some place I'm studying? Like the Yukon.
--->'''Rachel:''' Now wouldn't that be convenient.
* In the ''WesternAnimation/AvatarTheLastAirbender'' episode "[[Recap/AvatarTheLastAirbenderBitterWork Bitter Work]]," Iroh teaches Zuko all about the principles of [[ShockAndAwe lightning bending.]] These same principles are later applied when [[spoiler:Zuko deflects Ozai's lightning during his HeelFaceTurn, and later in the GrandFinale when Aang does the exact same thing. Incidentally, it was Zuko himself who taught this technique to Aang, figuring that one day it would come back to save his skin.]]
* Subverted in SpongebobSquarepants: Spongebob's boating class goes on a field trip to a famous boat, where Spongebob annoys everyone (Mrs. Puff in particular) by rattling off useless trivia. The boat then appears to have activated and is barreling towards town, so Spongebob is called on to save the town. [[spoiler: Nope, the boat was being hauled by a smaller tug, and Spongebob's contribution to the whole mess was 1) start the disaster in the first place, and 2) crash the boat into a building.]]
[[/folder]]

to:

[[foldercontrol]]

[[folder:Anime & Manga]]
[[index]]
* In the HotSpringsEpisode of ''Anime/NeonGenesisEvangelion'', they use precisely this grating dialogue when they destroy an angel with the help of thermal expansion, which by amazing coincidence, Shinji had been studying that very day.
** Worth it for the line "[[DoubleEntendre Thermal expansion... how embarrassing]]", though.
*** The example used by Asuka was pretty sweet, too.
* Episode 3 of ''Anime/NightWizard'' featured [[RagnarokProofing a millenia-old puzzle]] about the color of a burning metal's flame guarding a CosmicKeystone. No points for guessing what the lecture earlier on in the episode was about.
* Done rather effectively in ''LightNovel/FullMetalPanic! The Second Raid'', where during a mission briefing one of the SRT members makes a joke about [[spoiler: the Cretans Paradox. When the commanding officers realize that [[TheMole a mole]] is relaying their communications to the enemy, they manage to turn the tables by obliquely referencing the joke, which lets the field teams know to do the exact opposite of what they're ordered thereafter.]]
* An episode of ''Anime/TransformersVictory'' had an early scene of Wingraver and Dashtacker teaching Jean about levers. Sure enough, later in the episode, he came up with a plan to use a lever to free a trapped human.
* Kakashi's lecture about revenge before the Sasuke retrieval arc of ''Manga/{{Naruto}}''. Guess what becomes one of the central themes of the manga (and not just to Sasuke)?
** During Naruto's Rasenshuriken training, he finally nails it after asking Kakashi how to "look towards right and left at the same time", whereupon Kakashi creates a shadow clone, inspiring Naruto to use shadow clones to do two things at once. The same phrase uttered word-for-word by Fukusaku later during his Sage Mode training gives him the idea to overcome his obstacle, again by using Shadow Clones.
* Doesn't exactly help the protagonist solve anything, but a plot point is explained this way in ''Manga/TheVisionOfEscaflowne''. Specifically, a class lecture drops off the random tidbit that [[spoiler:Isaac Newtown studied gravity blah blah but also in a metaphysical sense]]. Meanwhile the main villain [[spoiler:is revealed to be from Earth, for his true first name to be Isaac, and has created a ton of powerful inventions for Zaibach, including technobabble about the gravity of hearts and such]]. Hmmmmmmmmm.
* Gon in ''Manga/HunterXHunter'' escapes from a powerful enemy by remembering a lecture on how to swindle [[CrackIsCheaper antiquarians]].
* In ''Manga/PokemonSpecial'', Pearl is told by the Fan Club President that in order to prepare for Platinum's first Super Contest performance, each member of the Sinnoh Trio must do one different part. Much later on in the story, when everyone is freaking out over the revelation that Team Galactic is planning to blow up the three lakes, Pearl notices the ribbon that Platinum's Empoleon won and remembers the President's words. He then declares that each of them must go to and protect one different lake, marking the first time in their journey together that the three of them would have to travel alone.
* ''Anime/{{Pokemon}}'': the actual lecture is not shown on-screen, but the only reason Ash et. al could get out safely from the S.S. Anne disaster is that Misty studied the ship's layout for a class project.
[[/folder]]

[[folder:Films -- Live Action]]
* Indiana Jones and The Last Crusade. Indi mentions in class that there is no buried treasure and X "never marks the spot" Later in the film he discovers that the path to the Tablet is under the a number ten, which turns out to be the Roman numeral X, so X marks the spot.
* The titular character of {{Fresh}}, while suffering a HeroicBSOD after his would-be girlfriend was killed in when an AxCrazy gangster shot up the playground when he was losing at basketball, gets berated by his [[SamuelLJackson father]] who only notices [[WellDoneSonGuy how poor his son's chess game is]]. Still, the [[ChessMotifs chess lessons on the importance of exploiting your opponents character and sacrificing any game piece if it means winning]] come in quite handy [[spoiler: when Fresh enacts his plan to escape his neighbourhood by maniuplating the gangsters to kill each other, then turning in the survivors to the police and applying for witness protection,]] while relying on the fact that he is JustAKid to stay BeneathSuspicion.
* Variation occurs in ''Film/MontyPythonAndTheHolyGrail'': at the beginning, a castle guard gets distracted by King Arthur's "[[TheCoconutEffect coconut horse]]" and goes into great length talking about whether swallows could carry coconuts into England. Toward the end of the film, the Bridgekeeper asks, "What is the air-speed velocity of an unladen swallow?" Arthur remembers a detail discussed by the original guard and asks, "What do you mean? An African or European swallow?" which causes the Bridgekeeper to fall into his own trap. In the original ending, which was cut at the last minute, the English army was saved by sparrows dropping coconuts on the French.
* ''SlumdogMillionaire'' uses a justified version of this trope to great effect. The entire plot is centered on the protagonist explaining episodes in his life that have given him unexpectedly useful knowledge.
* In ''{{Shorts}}'', Helvetica does her science projects on female wasps and their habit of "male-stuffing". Later on, [[spoiler:in the fight against Giant Mecha Mr. Black, Helvetica uses the rainbow wishing rock to wish that she were a giant wasp... ''male-stuffing''.]]
* ''TheDevilsBackbone'' has a borderline example: in one scene, the boys are in class learning about prehistoric man, and Carmen shows them a picture of hunters taking down a mammoth as a group. The image is invoked at the end, when the boys [[spoiler:bring down Jacinto by stabbing the crap out of him with sharpened sticks, before shoving him into the well for [[UndeadChild Santi]].]]
* [[DrivesLikeCrazy Elwood Blues]] goes on one of these lectures to his brother in ''TheBluesBrothers'' on the benefits of a cop car: cop shocks, engine, suspension, etc. This comes in handy with the utter vehicular chaos that ensues.
* ''Film/StarshipTroopers'' has [[DrillSergeantNasty Sergeant Zim]] demonstrate the importance of combat knives despite it being a '[[NukeEm nuke fight]]', citing, "The enemy cannot push a button, if you disable his hand!" This comes in handy later when Carmen [[spoiler:cuts off the [[HiveMind Brain Bug's]] brain-sucking proboscis with a concealed combat knife.]] Interestingly enough, she wasn't actually at that lecture, being a fleet pilot, and all.
** Worth noting, she ''was'' at the lab class where they disected bugs, causing her VomitIndiscretionShot. She seemed to get the hang of using a knife on bugs later on, didn't she?
** An {{Anvilicious}} non-science version also happens with Raczak's high school lecture about the difference between a Civilian and a Citizen. Rico, Carmen and Dizzy are present for that scene early on, and just before the film's final act, the three are together again, where Rico [[MeaningfulEcho talks about the difference between a Civilian and a Citizen]] [[spoiler: while he and Carmen attend Dizzy's funeral. A Citizen is willing and prepared to sacrifice themself for the good of society, while a Civilian is not.]]
* In ''[[Literature/{{Twilight}} Eclipse]]'', Jacob's family tells a story about how a woman helped distract a vampire by cutting herself, which Bella does in the final battle. Also, Jasper warns everyone not to let a vampire grab you under any circumstances. [[spoiler: Jacob forgets this and is nearly broken in half with a BearHug]].
* The first ''Film/JurassicPark'' sees paleontologist Dr Alan Grant scare a poor child with detailed information about the velociraptor pack mentality and how they tend to eat their prey.
* In ''{{Copycat}}'', Sigourney Weaver's character gives a lecture on serial killers and at one point asks all the men in the audience to stand. Several of the men's faces are then projected on the screen behind her as she explains that men are more likely to be serial killers, and how they look just like everybody else. Naturally, the movie's villain (a serial killer himself) is one of the men projected on the screen.
* ''King Ralph'' could practically be the naming of this trope. At the end, when Ralph is looking for a way out, he tells an aide that he usually ignores what the aide says, that aide once said, 'I think we made the right choice'. Ralph remembers that and asks who the other candidate is, and the denouement begins.
* In ''Film/MeanGirls'' Cady uses this to win the [[PunnyName Mathletes]] competition. She harks back to an old maths class to answer a question about limits.
* ''{{Timeline}}'' begins with a history lesson the the archeologists. They go back in time and need to use exactly what they just learned.
* ''Film/BlackDeath'' has the method of mercy-killing.
* ''Jett Jackson: The Movie'', the made-for-TV movie of ''TheFamousJettJackson'': After Jett and his TV character Silverstone [[TrappedInTVLand have switched places in each other's universes]] and have been living in each other's shoes for a while, Jett's grandmother later approaches Silverstone in a quiet moment, where it's revealed that she'd already figured out he wasn't her grandson. When Silverstone asks how she knew, she explains that when Jett was born, she looked him in the eyes and knew that from thenceforth she'd always be able to know and identify him. [[spoiler:In the climax of the film, the shape-shifting BigBad in Silverstone's world makes himself look like Jett, causing a doppleganger problem when the three confront one another; Jett and Silverstone look each other in the eye and know they're both the real deal]].
* {{Pirates of the Caribbean}}. In the first movie, Will frees Jack from prison using a bank as a lever on the prison door. In the third movie, when Jack is captured by Davie Jones, guess what he does to the prison door?
* In the DVD extras of ''X-Men'', the young mutants are learning about ancient Rome. Rome started out persecuting Christians, and then wound up becoming a Christian empire. How did this happen? "The Emperor became a Christian!" Which is exactly [[spoiler: what Magneto had in mind with his plan to turn all the world leaders into mutants.]]
[[/folder]]

[[folder:Literature]]
* Hermione constantly saves the day in ''Literature/HarryPotter'' because she was the only one paying attention in class when the relevant magic was discussed.
** This sort of thing is even done across ''books''. In the fourth book, Dumbledore casually mentions a room filled with chamber pots that he found when he desperately needed a bathroom, and then was unable to ever find again. In book 5, the room is formally introduced as the Room of Requirement, and ends up being an integral part of the story in every remaining book in the series.
***
ChekhovsClassroom/{{Anime And in the very first book, Snape quizzes Harry, and one of the questions is about bezoars. In book six, it's used to save Ron's life, although Harry re-learns about it from Snape in a roundabout way.
** [[RunningGag "Has]] ''[[RunningGag no-one]]'' read [[{{Doorstopper}} "Hogwarts: A History"]]?
Manga}}
* In DanBrown's ''AngelsAndDemons'', an early discussion of how much a small flat object can slow down a falling person saves Robert Langdon's life when he uses a window cover to slow his fall from an exploded helicopter. This is also lampshaded at the time the discussion takes place.
-->''[[LittleDidIKnow Little did Langdon know]] this information would save his life in a matter of hours.''
ChekhovsClassroom/{{Live-Action Films}}
* Modern pulp author MatthewReilly uses this to a ''ridiculous'' degree. Two examples:
** In ''{{Temple}}'', there's a throwaway sentence from the protagonist about how he'll need to change his PIN number after reading a story in the paper about how most people use their birth dates as pass codes. Guess how he defuses the superweapon his brother worked on?
*** Guess again, it wasn't his birthday. But that example was used as a starting point. [[spoiler:His brother always used Elvis' army serial number as his PIN. The {{Nazi}} scientist used his supposed date of execution.]]
** In ''{{Area 7}}'', a precocious youth found in the middle of a government base delivers a buttload of the kind of trivia kids that age accumulate and share at any opportunity, including how komodo dragons are sensitive to changes in the Earth's magnetic field. So there's a scene where the main character has to fight off ''komodo dragons'' in a watery pit with his magnetic grappling hook.
ChekhovsClassroom/{{Literature}}
* Subverted and lampshaded in ''TheHitchhikersGuideToTheGalaxy''.
-->Arthur: You know, it's times like this I wish I'd listened to my mother.
-->Ford: Why, what did she say?
-->Arthur: I don't know, I wasn't listening!
ChekhovsClassroom/{{Live-Action TV}}
* In the Strange Matter book 'Knightmare', the protagonist remembers a comic his friend told him about in where crossbow being the only weapon to pierce the bad guy's armor. He later uses a crossbow to evil the pierce the evil knight's armor and kill him.
ChekhovsClassroom/{{Video Games}}
* An opening scene of ''Literature/GalaxyOfFear: Eaten Alive'' has a zoology lesson mentioning how the fearsome rancor, which usually kills anything it sees... except for the tiny gibbit birds which venture into its mouth to clean its teeth. The characters end up on the planet [[IDontLikeTheSoundOfThatPlace D'vouran]], [[spoiler: which is a carnivorous entity that will slowly eat any beings on its surface except for the native Enzeen, who make people want to stay there.]]
** In ''The Nightmare Machine'', Lando teaches Zak how to play cards, and that "A good rule to follow is that if the other guy is acting normal under unusual circumstances, you can bet he's bluffing." Ultimately that's how he knows he's in [[spoiler: an illusion]] later.
** ''The Doomsday Ship'' has Tash finding a bit of Jedi lore about how sometimes it's better to take "action through inaction", or that waiting is sometimes a valid response. She shows it to her brother. After that, Zak finds his uncle playing dejarik on the computer and taking his time despite an icon on the screen flashing "YOUR MOVE". Uncle Hoole says sometimes the computer has to wait, he's strategizing. This is important later.
[[/folder]]

[[folder:Live Action TV]]
ChekhovsClassroom/{{Web Original}}
* Even ''Series/BuffyTheVampireSlayer'' isn't above using this trope at least once. In order to defeat the evil science teacher who is actually a giant praying mantis, Buffy uses the recorded sound of bat sonar to "make [her] nervous system go kerplooey". She learnt about that in science class earlier in the episode (though, thankfully, from the previous science teacher. No villain should be stupid enough to teach a class their own weaknesses).
** That's not how she ultimately kills the praying mantis. She does that with a big machete.
*** It's Buffy, after all.
* ''Series/DoctorWho'' used to do this on several occasions, partly due to originally being conceived of as an edutainment program. For example, in the early story "Marco Polo" the condensation of water was a key plot point, while in "Planet of Giants", that pressurised cans explode when heated was another point. The Daleks were originally defeated due to elementary knowledge of electrical conductivity. The same technique was used to teach history in its early historical stories. Though most of the explanations happened in the course of events, not given out only to later be recalled.
* Every episode of ''BlackHoleHigh'' (a.k.a. ''Strange Days at Blake Holsey High'') featured this. Apparently, the unpredictable wormhole at least had the good manners to follow the [[strike:state]] [[CanadaEh provincial]]-mandated science syllabus exactly.
** Given the way physics works at Blake Holsey (namely, that its laws will bend to teach you an Important Moral Lesson), it is entirely possible that the wormhole was doing it "on purpose", and the physics lectures or experiments in act 1 were really shaping the physics weirdness in act 2.
** Or the time traveller could have done his history research and made sure the syllabus matched.
* A lovely children's education show called ''Series/{{Storylords}}'' entirely revolved around this. Somehow, Mrs Framish the reading teacher, always had either covered the necessary reading skill that day, or taught it the next day, in plenty of time for our hero to use it to defeat Thorzuul.
* Subverted in ''StargateAtlantis'', when Sheppard finds himself in an F-302 latched onto a Wraith Hiveship in hyperspace. He flashes back to a memory of [=McKay=] and Zelenka arguing about whether a non-hyperspace capable ship could detach from another one while in hyperspace without being destroyed, which is exactly what Sheppard needs to know. Then they ask Sheppard what he thinks, but he's not paying attention because he's flirting with the woman at the next table. He ends up not taking the risk, and has to wait for the Hiveship to leave hyperspace.
* Crossed with IKnowYouKnowIKnow in the [[http://www.youtube.com/watch?v=JcVAcxayiFM 'Fingers and Fumbs']] episode of ''{{QI}}'', where host Stephen offers the contestants an opportunity to go double or nothing on a forfeit by playing RockPaperScissors with him. He mentions that, psychologically, people tend to pick scissors first, because it's commonly believed that others would play rock first, and so would play paper to counter it. Phil and Dara both tie with him on scissors the first three times it happens (Phil having played twice). The fourth time, however, [[spoiler:Phil exchanges an obvious glance with Alan, and psyches Stephen into playing paper while he plays scissors. Dara and Alan also get to defeat Stephen, both using rock while Stephen kept using scissors.]]
* ''{{Glee}}'': "Hermaphrodite Nazi Sympathizers."
* The third episode of BBC's 2010 ''Series/{{Sherlock}}'' had Holmes fighting an assassin in a planetarium while an astronomy lecture played in the background. Wouldn't ya know, the lecture contained a clue that helped Holmes identify a painting as a fake and solve Moriarty's fourth challenge.
* [[ExploitedTrope Exploited]] by the crew on ''{{Leverage}}''. While setting up a con on a college student, Nate plays a professor who antagonizes the mark so that Hardison can make friends with him. The lecture Nate gives is about the prisoner's dilemma problem in game theory, and he tells the class that it's always better for the prisoners to turn on each other. Later, they put the mark in a situation where he has the option of turning on his confederates, and he flashes back to Nate's lecture and decides to do it.
** In real game theory, it's better to cooperate.
[[/folder]]

[[folder:Video Games]]
* The ''VideoGame/{{Persona}}'' series:
** Sort of used in ''VideoGame/{{Persona 3}}'': [[spoiler: a teacher obsessed with magic explains the significance of the major arcana of the tarot about halfway through the game. This becomes at least marginally important when the Final Boss states that Death, the 13th arcana, represents the end. However, as the teacher explained way back when, Death is merely a change, not the end, and there are another 8 major arcana after Death, which allows the protagonist to use the ''true'' final arcana, The World, to defeat the BigBad.]]
** Used in a similar manner in ''VideoGame/{{Persona 4}}'', [[spoiler:by the same teacher no less. While on a trip to the high school from ''VideoGame/{{Persona 3}}'', he tells you the story of Izanagi and Izanami. Which explains the motivation behind the final boss and how you beat her in the end.]]
* ''VideoGame/KingdomHearts358DaysOver2'' has a kernel of wisdom, courtesy of Xaldin--he warns that the bridge to the Beast's Castle is the only point of access, so if a powerful enemy were to attack the area it'd come from there. Both foreshadows the appearance of such a boss later in the same game, and is a CallForward to ''VideoGame/KingdomHeartsII'' where Xaldin engages you on the bridge.
** In ''Birth By Sleep'' Eraqus tells Aqua classified information only Keyblade Masters are allowed to know, but this knowledge isn't revealed to the player [[spoiler:until the Final Episode where a flashback reveals Eraqus told her how to protect the Land of Departure by turning it into Castle Oblivion]].
* It gets glossed over early on in ''[[LegacyOfKain Soul Reaver]]'' that vampires are vulnerable to certain sound frequencies, but this doesn't serve much purpose except for a sound-based attack spell and a non-canonical deleted ending. Then three games later ''Defiance'' pits us against [[spoiler:Turel]], a vampire with SuperSenses who can only be harmed by ringing a series of giant gongs.
* Present in the Fate route of [[VisualNovel/FateStayNight Fate/Stay Night]], as [[StealthMentor Archer]] decides to give a few hints about his magic to Shirou, with plenty of [[DeadpanSnarker sarcasm and veiled threats thrown in.]] Our hero later uses all of the information gained [[spoiler: to project Caliburn and defeat Berserker]].
--> '''Shirou:''' ''"It wasn't his usual harassment. Those words held an importance that I need to understand right now. -- No, saying that... [[IdiotHero Weren't all of his words a warning that I shouldn't have ignored?]]''"
* In the first year of GrimFandango, the janitor demon lectures you that spraying the fire extinguisher on the packing foam causes an explosion. You use this information later on in the fourth year, where [[spoiler: you use it to build a rocket to save Glottis]].
* Used in [[HalfLife Half-Life 2 Episode 2]]: At White Forest, a rebel is teaching others about the effectiveness of an AR2 Combine ball against hunters, a while before [[spoiler:the White Forest rocket is attacked by hunters and striders]].
* In ''[[SpaceQuest Space Quest V]]'' you begin the game by passing a test that gives ridiculous answers to questions like "how to best defeat an android bounty hunter" -- [[spoiler:"drop a rock on him"]]. Several of those turn out to be answers to in-game puzzles.
* In ''VisualNovel/DanganRonpa: The Academy of Hope and the High School Students of Despair'', several days end with Monokuma holding a short "Monokuma Theatre" segment. While these can sound quite random (especially as he enjoys reminding everyone that [[EverythingsWorseWithBears he's a bear]]), sometimes they foreshadow future events.
* In the first AceAttorney game, [[spoiler:von Karma patronizingly lectures Phoenix about PIN numbers. He even uses his own number as an example. Sure enough, it's needed later. Of course, giving out your PIN number in open court is both incredibly arrogant and entirely in-character.]]
[[/folder]]

[[folder:Web Original]]
* In the WhateleyUniverse story "Ayla and the Tests", Phase misses several days of school and gets a big lecture in the lab section for Powers Theory class from Dr. Yablonski on Warper powers and warp displacement fields of 'giants' (Warpers who use their power to apparently grow to huge size). In a LampshadeHanging, Phase even refers to him as MisterExposition. Guess what Phase faces when they go to Boston? A forty-foot giant who's a warper.
** In "Ayla and the Birthday Brawl", Ayla shows (s)he knows too much about taking out mutants with powers, and she talks all about it on the way back from martial arts class. What she says about fighting Package Deal Psychics saves Lancer's life in the big final fight.
* The [[KidHero students]] at the [[GlobalGuardiansPBEMUniverse Hyperion Academy]] used the information they learned in about electro-magnetism during their weekly physics class to defeat the villainous Lodestone.
* {{Lampshaded}} in AVeryPotterMusical: at the beginning, Snape asks if anyone knows what a Portkey is. His next question is if anyone knows what {{Foreshadowing}} is.
[[/folder]]

[[folder:Western Animation]]
* Generally averted in ''WesternAnimation/CodeLyoko''. Though some classes at the start of an episode may have a coincidental link to future events (for example, a lecture about nuclear energy production happening just before XANA attacks a nuclear power plant...), the specific content of the lecture would hardly be of any help for the heroes, since Jérémie and Aelita know probably more than the teachers already. At best it will be mentioned as a joking aside. If the class directly influences the events, it's usually because it gives Jérémie an idea that he next tries out -- like the biology class about ants that prompts him to create the "Marabounta".
* Parodied in the ''WesternAnimation/AmericanDad'' episode "Stan's Night Out". Stan watches a television show about gardening, where the host says that you can start a lawnmover with the first pull, if you stand on the back wheels. Later, when he's trapped by a ruthless crime lord in a shed, he sees a lawnmover, and proposes a wager; if he can start it ten times in a row, the bad guy will let him go. So, he stands on the wheels, pulls the rope... and the lawnmover doesn't start.
* In what has to be a spoof, an episode of ''KimPossible'' has Ron tutoring Kim in Home Economics. Later on, Kim uses Ron's advice when Shego has her trapped in a giant industrial mixer. While facing certain death from the large mixer blades, Kim Possible grabs the mixers, stays/spins with it, follows it up into the air, lets go of it and defeats Shego by doing a jump kick that screws with the laws of physics. All thanks to a lesson about cooking where Ron says to her how she shouldn't fear the mixer but instead be one with it.
** In a later episode, ExecutiveMeddling forced them to have a lecture about good nutrition and the five food groups. Ron falls into a vat of the Titan Formula and becomes a junk-food-eating-monster. Luckily Kim and her brothers know the cure for that!
*** And to drive home the fact that they had to make this episode, Ron gives a AndKnowingIsHalfTheBattle by warning kids [[SpoofAesop not to fall into vats of experimental super growth formula.]]
* In ''TheMagicSchoolBus'', usually the dangerous situation is the lecture, or an extension of it, and the resolution always conveniently requires them to recap everything they've learned that day. Arguably justified as intentional on Ms. Frizzle's part as an aspect of her teaching style.
* Normally subverted in ''MightyMax'' whenever Max comes up with a clever plan to save the day. It's usually not until ''after'' the villain is defeated that Max gives the Chekhov's Lecture, either to the other characters or directly to the audience in the {{Edutainment}} sections at the end of each episode.
* Referenced on ''TheSimpsons'' when a tipped salt silo from the local cracker factory melts all the snow surrounding the school and Martin tastes it and declares that it melted with "a little help from our friend Sodium Chloride!" [[RunningGag He then gets punched in the gut by Nelson.]]
** Another episode has Bart rush out of a class on Roman numerals to steal the town's lemon tree back from Shelbyville. Later on in the same episode he ends up in a room with a choice of doors labelled I-X and a piece of paper that claims that the seventh door is the exit and all the others contain man eating tigers. In a subversion, he doesn't even remember the class but makes the right choice anyway thanks to his knowledge of ''Film/{{Rocky}}'' films.
** And in case you're wondering, the film in question Bart comes up with? [[spoiler: [[NumberedSequels ''Rocky VII:'']][[OddlyNamedSequel '''Adrian's Revenge''']].]]
* The Phantom of ''FlyingRhinoJuniorHigh'' frequently transforms the school into a death trap based on whatever lecture (or sometimes just topic of discussion in general) the children were having that day. This naturally leads to the students who were paying attention being the ones to get everyone out of trouble.
* ZigZagged in ''WesternAnimation/WinxClub'': Most of the time class lessons seen on the show are not immediately applied, usually because they're basic spells or magical theory. However, a few lessons, like the Plasma Sphere for Tecna and convergence magic for the whole group, are taught and then used that episode or a few episodes later.
* ''TotalDramaWorldTour'' has Sierra mentioning that Cody's birthday is April 1 during the first episode. In ''Aww, Drumheller'', [[spoiler: she makes a cake to celebrate his birthday, which both warms him up to her (because last year his birthday was ignored) and also got her kicked off when the "candles" made the plane explode.]]
* Parodied in MegasXLR, when Coop has sudden flashback to his high school science teacher scholding him for not paying attention and saying that one day he might need her lesson. She was right, as what she was talking about happens to be contain informations about [[MonsterOfTheWeek bad guy's of the week]] main super weapon and Coop really doesn't remember them.
* In one episode of ''WesternAnimation/TheMummy'' animated series, Alex manages to avoid being crushed by falling ruins, commenting on his recent geometry lesson really came in handy.
* Inverted and parodied in ''MaxSteel'':
** Inversion: Josh is required to write an essay on the Cold War with a fresh angle. A mission he goes on later that day requires him to go through escape tunnels in Washington D.C. (something vaguely mentioned in the lecture), and he uses that knowledge to get an A+ on his essay.
** Parody:
--->'''Max:''' How come we never have a mission to some place I'm studying? Like the Yukon.
--->'''Rachel:''' Now wouldn't that be convenient.
* In the ''WesternAnimation/AvatarTheLastAirbender'' episode "[[Recap/AvatarTheLastAirbenderBitterWork Bitter Work]]," Iroh teaches Zuko all about the principles of [[ShockAndAwe lightning bending.]] These same principles are later applied when [[spoiler:Zuko deflects Ozai's lightning during his HeelFaceTurn, and later in the GrandFinale when Aang does the exact same thing. Incidentally, it was Zuko himself who taught this technique to Aang, figuring that one day it would come back to save his skin.]]
* Subverted in SpongebobSquarepants: Spongebob's boating class goes on a field trip to a famous boat, where Spongebob annoys everyone (Mrs. Puff in particular) by rattling off useless trivia. The boat then appears to have activated and is barreling towards town, so Spongebob is called on to save the town. [[spoiler: Nope, the boat was being hauled by a smaller tug, and Spongebob's contribution to the whole mess was 1) start the disaster in the first place, and 2) crash the boat into a building.]]
[[/folder]]
ChekhovsClassroom/{{Western Animation}}
[[/index]]
7th Dec '12 2:01:34 AM atheist723
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** [[RunningGag "Has]] ''[[RunningGag no-one]]'' read [[{{Doorstopper}} "Hogwarts: A History"?]]

to:

** [[RunningGag "Has]] ''[[RunningGag no-one]]'' read [[{{Doorstopper}} "Hogwarts: A History"?]]History"]]?
7th Dec '12 1:59:43 AM atheist723
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** [[RunningGag "Has]] ''[[RunningGag no-one]]'' [[RunningGag read "Hogwarts A History"?]]

to:

** [[RunningGag "Has]] ''[[RunningGag no-one]]'' [[RunningGag read "Hogwarts [[{{Doorstopper}} "Hogwarts: A History"?]]
27th Nov '12 5:21:36 PM NeonFox
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Added DiffLines:

** In real game theory, it's better to cooperate.
13th Nov '12 9:31:47 PM Joysweeper
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** ''The Doomsday Ship'' has Tash finding a bit of Jedi lore about how sometimes it's better to take "action through inaction", or that waiting is sometimes a valid response. After that, Tash finds his uncle playing dejarik on the computer and taking his time despite an icon on the screen flashing "YOUR MOVE". Uncle Hoole says sometimes the computer has to wait, he's strategizing. This is important later.

to:

** ''The Doomsday Ship'' has Tash finding a bit of Jedi lore about how sometimes it's better to take "action through inaction", or that waiting is sometimes a valid response. She shows it to her brother. After that, Tash Zak finds his uncle playing dejarik on the computer and taking his time despite an icon on the screen flashing "YOUR MOVE". Uncle Hoole says sometimes the computer has to wait, he's strategizing. This is important later.
This list shows the last 10 events of 45. Show all.
http://tvtropes.org/pmwiki/article_history.php?article=Main.ChekhovsClassroom