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can't help it, tvtropes.org makes me laugh everytime I dig into it. Just sooo many examples, most of them qouting **something** I can identify with.
I mean, come on, how many of you haven't read/watched something with a 'deadly graduation' sequence?
http://tvtropes.org/pmwiki/pmwiki.php/Main/DeadlyGraduation You know, the classic "training with best buddy X. Now, as proof your are worthy/loyal/badass enough... kill your buddy or he kills you."
and then there's very serious ones like a look at the classic "36 stratagems" of chinese/asian military thinking...
http://tvtropes.org/pmwiki/pmwiki.php/Main/TheThirtySixStratagems and the really annoying examples that often have been pulled on people in real life, such as: The Wounded Gazelle Gambit
http://tvtropes.org/pmwiki/pmwiki.php/Main/WoundedGazelleGambit