Plot twists are like Nicolas Cage: you either love them so viciously that it hurts and you're slowly alienating your family and friends because you can't control your obsession, or you think they suck really, really hard, and should be forever banished to a bargain bin and slowly phased out of existence. Or something like that: I'm not very good with comparisons. As a writer's tool, a plot twist can imbue a script with an added dose of "wow," forcing viewers to reconsider everything they've just spent two hours staring at whilst making them feel kind of dumb in the process. As a marketing tool for movie studios, plot twists entice the possibility that viewers will go back and revisit a movie so that they can try to understand things properly, all whilst being awed and amazed at just how clever Hollywood has been. Everyone wins (well, except for the movie-goers: paying to see a movie twice is definitely not a win). Wherever you might stand on the matter plot twists, it's common knowledge that - used incorrectly - these things can cause a movie to come crashing down under the weight of its own logic. That said, incorporating a plot twist into your movie is something of a major risk, then, especially if the entire plot hinges on it making sense. In the cases of the 8 movies we've assembled here, the associated plot twists don't work at all...