Showed some of my friends Re:incarnation recently as a piece of Japanese horror with nice twist (it's a little too early in the movie for me to call it a twist ending). What I ought to do next is show them Ju-on 1&2, but I keep finding copies of the American version instead when I look for it, which is annoying. The American remake is less varied, less suspenseful, and plot/timeline alterations mean it makes less sense. Plus, in the original the curse is clearly growing in strength and reach with each kill which Fridge Logic says may have started the occult apocalypse, unless mankind can just reproduce fast enough to stay ahead of it.
In case you missed it when I first talked about it, MarbleHornets is a very good example of amateur horror, at least until it jumps the shark, and watching the first 14 episodes is a good way to kill an evening as long as you don't mind shaky camera footage and possibly frightening yourself. Even some of the later episodes manage to regain a lot of the feeling that many fans feel it loses past a certain point. It's cheaply made but manages to, at least much of the time, hang on to a feeling of creeping horror. http://www.youtube.com/user/marblehornets#p/u/21/Wmhfn3mgWUI