My favorite would be mystery/suspense. I love a good twist of unexpected horror, too.
My least favorite would be those annoying high school movies where young, ridiculously beautiful people strive to accomplish a corny dream, get side-tracked/berated/humiliated by immature antagonists. In the middle, they feel mopey/get distracted for awhile, get advice from some sappy friend/parent/old fogey and suddenly try their hardest, complete an insane amount of progress in very little time and predictably end up winning whatever stupid dance/singing/popularity contest/tournament (you know the ones, I'm sure). Those I cannot stand.
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