The Horror Challenge,
A great sequel.
I'm sorry but I will have to say Paranormal Activity 2 again. I thought the original was good, but not terribly scary, but when I saw Paranormal Activity 2, I was terrified. In fact, it was the very first time I had a nightmare from a horror movie. I know if I should mention all kinds of 'old' horror movies, but as I mentioned before, I'm not really a fan of them, so I have to say that I don't know a lot of them :(.