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1.
The "twist ending" that pervades science fiction, horror, mystery, and fantasy writing, television, or film -- basically, anything that might get the label "genre". The classic example is that Bruce Willis was dead the entire time.
Marlene: Hey, did you watch Criminal Minds last week?

Jill: Yeah, but I figured out the genre twist just before they revealed the kid was the killer.

Marlene: I got it before the end of the second commercial break.
by Yet Another Josh Cohen April 27, 2009