Scariest movies ever (Kebir Blue)

What's the scariest movie you've ever seen. The kind that would make you want to sleep with your parents. (i know, that's gross.) not just
gory.

Alien
http://www.youtube.com/watch?v=JehjqlzXwIQ

The Excorsist

Oh and Spaceballs

I'm not a fan of scary movies cause I don't find them scary, but the best ones I've seen are the Saw movies.

http://www.youtube.com/user/saw4movie?blend=1&ob=4