I must admit I love the Aliens series. But I have never been scared of any Horror movie I have seen. If I wanna get freaked out I would just watch a heap of ghost encounter documentries on the discovery channel. Thats creepy.
"It's always fun to kill a god." ~ Akuma (Marvel vs. Capcom 3)
I will have to say Friday the 13th movie series. There was always something about that machete wielding menace I liked. Plus I'm really excited for the remake in February. ^_^
I prefer suspense films, like The Shining, over the gory ones. Although I will admit to enjoying the Friday the 13th movies but that's probably more for the nostalgia. I recently/finally saw The Ring last weekend and it became an instant favorite.