in no particular order;
Dawn of the Dead,
Braindead,
Evil Dead 2,
Nightmare on Elm Street 3: Dream Warriors!
and of course, I spit on youre grave.

The Exorcist by far is the scariest movie I've ever seen. Managed to watch the whole movie alone at night the other day.

Forrest Gump.

And to add to the above:

My fave’ horror films are real-life experiences from Internet dating, which I use within my writing. You can learn a lot from horror films – in relation to dating, especially from people’s eyes. Consider the eyes of the following people:

1. A child cowering in a corner watching it’s parents fighting
2. A drunken woman in a psychotic marriage sarcastically arguing with her equally screwed up husband
3. A person who's just been grabbed around the throat from the front
4. Someone doped-up looking out of a window into space, having contemplated suicide moments earlier
5. An analytical psycho who hates you and wants you to sadistically suffer, but acts supportive
6. A sociopath having a conversation with his/her next victim and planning things in his/her mind

Now... review people’s profile photos on here very carefully. If you see any eyes present that give the slightest hint of any of the above eye-expressions, then walk away. You’ll be really glad you did!

I watched "Session 9" the other night. Low budget, and well acted; by actors rather than wannabe movie stars, including the ever dependable Peter Mullan. It was written with the specific location (Danvers State Hospital) where it was shot in mind. A creepy and unsettling movie
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"The tighter you grasp Lord Vader, the more it will slip through your fingers."

Alien (1979, by Ridley Scott), but it was named several times before...

Plus Phantasm (2nd part is most exciting, IMHO) - this haunting melody is worth the whole story.
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If I stop joking, I'll start whining... So please decide which side of mine you'd want!

Amityville 2: The posession
http://www.youtube.com/watch?v=XA_QDQnLDsI


The bit with the wrapping on the door was very scary.
I was watching that scene and somebody started wrapping my door, luckily it was just a friend with some beers

Also the scary music when the camera pans down the stairs and a sheet is thrown across the crucifix is quite eerie.

Several women from here via initial webcam chat. Utterly terrifying...!

I must admit the horror movies rarely see them but I of what I have seen the best horror was "hills have eyes"