The Scariest Films Ever -- Your thoughts?

Why haven't we tried this before? Oh, that's right... because it's really hard to define what is "scary" and what is "creepy" and what is "horror" in general... So for the sake of this post, scary and/or creepy counts. Whatever scares you is good enough.

We have plenty of users who have seen a wide variety of horror films, so we can sift through the cliche films that lightweights would list and get some more solid results.

If you rewatch a scary movie so many times, you get used to it. At that point, is it still scary?

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Here's my incredibly generic list, because I'm a lightweight. Feel free to bash it to bits.

The Amityville Horror (1979) - Haunted house horror that seems hopeless, seeing as how long it takes for them to heed the warnings, which are ample.
Black Christmas (1974) - Chilling, to say the least. Creepiest ending out there.
The Evil Dead (1981) - Moody, foggy, dark and dirty bloodbath in the middle of the woods.
Halloween (1978) - Sleepy small town horror at its finest.
The Omen (1975) - Non-stop building a sense of dread throughout, and no comic relief.
The Shining (1980) - Somehow, the over-the-top sense of it helps amplify a feeling of strong discomfort.
Suspiria (1977) - General creepy vibe throughout, because everything is off about this place.
The Terminator (1984) - The SFX are creepy as hell.

All originals, no remakes, because older stuff is inherently creepier.

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Tell us what you think are the scariest films ever.