Ok, I have to admit, this is my all-time favorite movie. Every time I watch it I see something new. And it does have a twist, much in the way of the Sixth Sense, so I can't tell you too much about it, but like the Sixth Sense, it's perfect. There's no mistakes. It's told in a completely different way, so it kinda has to be.
This is the first DVD I ever bought (well, I bought this, Casablanca and the DVD player in one trip). I can't say enough good things about this movie.