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in the episode The Explosion Implosion
Howard: Let's get going.
Sheldon: Are you gonna be this mopey all the way home?
Howard: I don't know, maybe.
Sheldon: There any chance you'd be cheered up by an amazing trigonometry riddle? (silence) Well, if you can't answer that, there's no way you're gonna get this riddle.
This helps us figure out whether you are a human or a cyborg.