This is the joint scariest movie I've ever seen, along with The Woman In Black. It's absolutely terrifying. The idea of an unknown spiritual force is a lot scarier than some maniac killer from a slasher film. Anyone who complains that you never see the ghosts is missing the point - this movie isn't about cheap shocks, it's about inch-thick suspense and brilliantly creepy moments. On top of the fear factor, the acting is great, as is the direction and photography. See it.