I like horror with a touch of tongue in cheek, the Evil Dead trilogy, Braindead, Bad Taste etc.

In terms of sci-fi horror the 1st and 2nd Alien movies are pretty damn good.

I like pretty much any classic horror or sci fi

The Fog is great too. Forgot about that one.

I actually like Escape From L.A. a lot. But the best ones are, of course, The Thing, Halloween, Big Trouble in Little China, Assault on Precinct 13, Escape From New York, etc.

Halloween is close, though. It's so elegant, so simple, almost elementally perfect. My favorite works of Carpentry are nothing unexpected, but I do have a special appreciation for The Fog, which I think is a tad underrated, and

same :)