Devil
The first movie by M Night Shyamalan that I have enjoyed since Unbreakable.
5 people get trapped in an elevator, mayhem ensues. The idea is that one of the people is the devil.
I didn't get the "devil conversation" that I love. You know the one, where the devil slowly reveals things about yourself that he/she has no way of knowing, until at the end, big reveal, its the devil.
This was more pull the rug out, with some elements of suspense and horror, and some heavy moments with a dark camera and ominous sounds, that were a little forced. Kind of like in a play when the lights go out and then one of the cast members is killed, but you don't see it.
But beyond that, I sincerely didn't see the ending coming (and in a M Night movie, you're guessing at what the big reveal is the whole time, so at some point you settle on a theory, yadda yadda). I really enjoyed it, very well acted and directed (although it should be noted that M Night only had the story, the screenplay and direction were others).
IMDB gives it a 6.5 out of 10, and i don't think that's a bad rating. I'd go as far as 7, 7.5 though. Worth watching.