Make mine with a twist (boxed spoilers, please)

This is partly inspired by advance publicity for the new movie *“Derailed”, * which makes it seem that it has a number of plot twists.

I love movies with twists; the more, the merrier. Do you have favorites? If so, please feel free to post them here, with a brief synopsis if you like. Links to IMDB would not be out of place. If you feel that you absolutely must reveal the plot twist, please keep it spoiler-boxed.

I’ll start with an older film. “Don’t Look Now”. Donald Sutherland and Julie Christie are a couple in Venice. Christie meets a woman who claims to have psychic powers, and Christie (freshly grieving the death of her daughter) believes in her abilities. Nothing is quite what it seems…

Rosebud … Is Kane’s sled