saw all the ones ace solid suggested.
havent seen the thing
not on netflix though
Ok, so I'll list some other horror movies I really liked:
-The Blair Witch project (It's a really good film, and interesting without dazzling special effects)
-Cloverfield (Maybe it's not as good on an ordinary TV rather then on Big Screen like I watched it, but it was one of the most intense cinema experience I ever had. The subway scene was incredible!)
-Jaws (but you've probably seen it)
-Shawn of the Dead (The greatest Horror / Comedy mix ever!)
-Seven (Brad Pitt and Morgan Freeman hunt a serial killer together, 'nuff said)
-Resident Evil (Somehow, or should I say miraculously, it is a good horror movie, so good in fact that it created a lot of horrible sequels)
If you've seen all those, I give up, and recommend you:
-The video game Amnesia: The Dark Descent (It's the greatest horror experience ever, scary as hell and it really brings you in. Buy it on Steam right now for 20$, really, do it!)