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Chekhovs Classroom / Western Animation

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  • The Adventures of Jimmy Neutron, Boy Genius: While Jimmy's knowledge is obviously far beyond the point at which anything learned in a 5th grade class should be of much use, his "brain blasts" will often arise from an off-the-cuff statement or factoid from the beginning of the episode that allows him to complete his ideas.
  • Generally averted in Code Lyoko. 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".
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  • Parodied in the American Dad! 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.
  • Kim Possible:
    • In what has to be a spoof, one episode 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.
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    • In a later episode, Executive Meddling 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 And Knowing Is Half the Battle by warning kids not to fall into vats of experimental super growth formula.
  • In The Magic School Bus, 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.
  • Normally subverted in Mighty Max 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 Classroom, either to the other characters or directly to the audience in the Edutainment sections at the end of each episode.
  • The Simpsons
    • Referenced 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!" 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 Rocky films. And in case you're wondering, the film in question Bart comes up with? Rocky VII: Adrian's Revenge.
    • While needing to prevent a meltdown, Homer tried to remember what he learned about it. It turns out Homer wasn't paying attention to the lessons because he was focused on trying to solve a rubix cube. Back in the present time, Homer blamed the still unsolved cube.
  • The Phantom of Flying Rhino Junior High 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.
  • Zig-Zagged in Winx Club: 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.
  • Total Drama World Tour has Sierra mentioning that Cody's birthday is April 1 during the first episode. In Aww, Drumheller, 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 Megas XLR, when Coop has sudden flashback to his high school science teacher scolding 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 information about the bad guys of the week main super weapon -and Coop really doesn't remember them.
    Teacher: One day you'll need to know what a quantum singularity is, and then you'll be sorry!
    Coop: Yeah, right.
  • In one episode of The Mummy 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 Max Steel:
    • 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 Avatar: The Last Airbender episode "Bitter Work," Iroh teaches Zuko all about the principles of lightning bending. These same principles are later applied when Zuko deflects Ozai's lightning during his Heel–Face Turn, and later in the Grand Finale 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. Unlike most other examples, this one is very justified: Azula was hunting Zuko and Iroh at the time, and she is a famous lightning user. Iroh was merely teaching Zuko how to beat a specific, very strong opponent.
  • Subverted in SpongeBob SquarePants: 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. 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.
  • The Lilo & Stitch: The Series episode "Spike" has Lilo to attend a family trivia contest. To get her family of aliens prepared for the questions about Earth's culture, she takes them for a sort of an educational walk around, in which they stop at a shop where Pleakley reads a T-shirt's label: "Wash with light colors only". During the contest, a question is given specifically for Aunt Pleakley: "True or false: Cotton t-shirts should be washed with light colors only." Pleakley feels smart for being able to answer correctly.
  • Used twice in Miraculous Ladybug:
    • The first time was in the episode "Dark Cupid", which started with the heroes' English teacher telling the class about how kissing is used to break spells in fairy tales. Ladybug later applies this method when her partner is affected by the villain's Hate Plague.
    • The second time was in "Princess Fragrance", which has the science teacher give a lecture on the flammability of perfume. Later, Ladybug has to get rid of a huge cloud of the stuff — and she just happens to be near a boat loaded with fireworks...
  • The Mixels episode "Every Knight has its Day" has Camillot learning how decisiveness is key when it comes to the difference between forming a Mix or a Murp, and his decisiveness ends up saving the day when he is the first one to take action during a Mixeloptor rampage at the zoo during a field trip.
  • In Wreck-It Ralph, Sonic the Hedgehog speaks about how dying outside your own game will kill you permanently. Ralph was about to sacrifice himself like this to save everyone, but was saved at the last minute. Turbo, on the other hand...
  • My Little Pony: Friendship Is Magic takes a bit of a twist on this. In "The Cutie Re-Mark - part 1", Twilight delivers a lecture about how "the long-term effects of the simultaneous acquisition of Cutie Marks has yet to be determined." Throughout her trips to alternate timelines that result from her and her friends not acquiring their Cutie Marks simultaneously, Twilight herself learns that "the long-term effects" can be profound in a universe where The Power of Friendship is a Sentient Cosmic Force.
  • In the Phineas and Ferb episode "Bee Story", Ginger can be seen listening to Baljeet talk about bee communication methods in the beginning. She later applies the methods in order to get the Fireside Girls' bees back in the hive.