#1. Alien
The mining ore tanker Nostromo was like a giant haunted house. Fantastic movie directed by Ridley Scott.
Alien would probably be top of my list too...but The Shining was just plain creepy, too.
My 21 year old saw The Descent and he said it was really scary. The Ring (which I’ve also never seen) was supposed to be a very disturbing movie too.
Agree. Just watched it again last week on DVD. It's still scary, even after 30 (!! wow - has it been that long) years. I remember seeing it in the movie theater when it first came out. I slept with the light on for a week.