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Chekhov's Classroom

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Boss: Jack, you need to know what it means to be a soldier. Today's friends might be tomorrow's enemies. Like next week, when you'll have to kill me.
Snake: WHAT.

Pay attention in class, especially science class, because you will need the information later in the episode.

This trope is the awkward tendency of programs to use precisely what they learned in school (almost always science) earlier that episode, and to lampshade it through grating dialogue. Shows aimed at an older audience can make it slightly more subtle; even so, it usually comes out like this:

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"Oh no! We're being attacked by Gef the Talking Mongoose. Wait a minute, say, Swotty McCliche, weren't you studying how to defeat talking mongooses just this morning?"
"Oh yes, I totally forgot. How conveniently stupid of me!"

Common in Edutainment Shows. May be the payoff for a "Reading Is Cool" Aesop.

Compare Strange Minds Think Alike and Lecture as Exposition.


Examples

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     Comic Books 
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    Fan Works 
  • In the Teenage Mutant Ninja Turtles (2012) fic A Day Without Leonardo (AO3 link here), Splinter gives the remaining turtles guidance on being a leader and working together during the first chapter's training. All of his advice is later put to use in the second chapter when the turtles go up against a gang of Kraang.

    Music 
  • The Dethklok song "Bloodrocuted" has the protagonist come up with the idea of using his own blood to electrocute his pursuers after having a brief flashback to his high school biology class, where he learned that blood conducts electricity.

    Podcasts 
  • In In Strange Woods, while Lexy stops going to survival training after John Francis breaks his wrist, she takes what she learned to heart. She uses examples of dead reckoning and other things Howl taught to make a case for sending a search-and-rescue team in the final episode when the adults assume the kids would be fine.

     Theater 

    Visual Novels 
  • Katawa Shoujo has this in Emi's route. Mutou, Yamaku's science teacher, takes Hisao aside for a short lecture about observing things (if you let him). Namely, that if you can't observe something directly, observe its effect on other things. This advice comes in very handy, as it unlocks new dialogue options when Hisao and Emi's relationship starts getting off-track.
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     Real Life 
  • Foreign language courses if you ever use them. NOT having language skills is not only inconvenient, but downright dangerous, especially if you ever have to deal with security forces or even just toughs.
    • Except when the security forces become suspicious because your foreign language skills are better than they would expect.

 
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Video Example(s):

Alternative Title(s): Chekhovs Lecture, School Saved My Life

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How Bitsy Learned to Drive

When Bitsy was young, her father gave her terrible driving advice. She would later use this advice to help her negotiation skills.

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