Alien/Aliens is a given for most people. I have been watching Event Horizon during the spooky season for years. What are some of your favorite books and movies with a horror/psychological thriller lean?
Sphere from Micheal Crichton. Both the movie and the book are pretty good.
It is more sci-fi than anything else, but i think it fits the thriller category as well.
Without going into spoilers, it is a story about scientists being deep down in the ocean, and strange things happening.
