One Missed Call. There is way more going on in this movie than I feel qualified to talk about. I've watched it twice now, I've read about it around the web, and yet the more I think about it, the more questions I have. I'm not sure if the film is intentially ambiguous, or if there are cultural references and translation problems that impede my understanding, but would make sense to a fluent speaker.
Regardless, it is a fascinating story.
( Spoilers behind the cut )