“Watch If You Dare” (0 stars out of four) was an unwatchable mess about an incoherent collection of horror stories, each one worse than the next. In the first, a masochist decides to cut off part of his skin as a means of sacrifice and sadism. In another, a dinner guest shows up and finds out the hosts are cannibals and that he’s on the menu. Sickening and stupid but also low-rent and boring, and some of the dreadful acting really has to be seen to be believed. For masochists and freaks only.