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?
Smart shut-in builds an implausibly powerful computer in an attempt to discern a pattern that is responsible for all things. He uses the golden spiral as evidence of such a pattern, and believes he will eventually take pi out to so many decimal places that such a pattern emerges there.
The psychological thriller aspect relates to what he experiences along the way, and how it ends. I have a theory about the ending, but no idea if it's an opinion shared by the creator or any others.