Holy crap I have a lot of these!
House of Wax (2005 remake): Sooooooo stupid, I only watch it again and again so I can watch Paris Hilton get a huge wooden pole thrown through her forehead. One of the funniest scenes in a movie that I've ever seen
Saw 1, 2, 3, 4: I don't find these movies scary, I find them very very humorous, but the blood and guts do put me over the edge sometimes
Any M. Night Shamalamen (or whatever his name is) film: I really don't like his films, they're pretty dumb. I do want to see The Happening, though
Alien 3: Utter crap. I really liked the first 2 Alien films, but this one sucked a$$, same with Alien Resurrection
The Terminator movies: I can't stand the Govenator
Christine & Trucks: Killer cars and trucks. Enough said
Any of the Jaws movies after the first one: You can't beat the original. The sequels were terrible
Open Water: Dumb
Dark Water: Very dumb
The Grudge: Super dumb
The Ring & Ring 2: Extremely dumb
I Know What You Did Last Summer: Just terrible
I'll Always Know What You Did Last Summer: Even dumber than the first
Anything with Will Ferrel and Jim Carrey: They aren't funny at all
Snakes on a Plane: Not scary, just very dumb and funny
Those low-budget horror films on the Sci-Fi Channel. I watch them every weekend because they are hilarious! A few of my favorites:
Caved In: Prehistoric Terror: Giant killer beetles trap and kill people in a cave
Beyond Loch Ness: The infamous Loch Ness Monster moves from Scotland to Lake Ontario. Pretty sh*t special effects in this, too
Black Sheep: My sides hurt and I had tears in my eyes after I saw this I was laughing so hard. The one part I hated was when one of the characters got his family jewels bitten off by one of the demon sheep. That'd be too painful
Tons more, I just can't remember them off the top of my head.