I'm not sure if I'm really call this a horror movie, so much as a psychological thriller, but it is disturbing. It's a little slower paced than what mainstream audiences are used to, but this is definitely a thinking person's movie. The plot centers around a man who receives anonymous video tapes sent to his house, and each tape shows a shot of them being spied on, in what seems to be obvious places that they would have noticed a camera. The story's amazing, the acting's amazing, the directing's amazing, it's just an amazing movie. And I love how much tension this director can bring without using any music or scare cues. Definitely check it out.