Memento was really good!
Just watched REC 2 last night at about 2am! Fuck me! Probably not the best time to watch that! Oh well, still a really good "horror", if you call it that, and a just a really good film. I'm not a big "horror" fan, but I think it is the best I have seen! They done it so well, the way it just follows on from REC. It's the best sorta "character with the camera, handheld, camera part of film" film ever, I feel, that I have seen. With that being said I think you may have to watch REC first, you may get away with it though, as will still freak you out. Plus it's alot more polished and and has better effects and make up, with the money and support generated from the first one, than the first one. Also it's in Spanish, so it's subtitled, but please don't let those type of things put you off from films.
And yes...creepy shit did sneak its way into my dreams last night!!! I had freaky freaky dream! Aaaarrrgghhh!!!