Scream
This famous horror movie is filled with twists and turns, like when Matthew Lillard, playing Stuart Macher, discovers that their gun has gone missing and is not in the drawer like they so thought. Once this is discovered, he utters the line "Ah...Houston, we have a problem." This moment was actually improvised by the actor. Turns out Houston didn't have a problem though, as it is revealed that Stuart was the killer all along!
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