I can watch dark movies, but not slashers / gore-fest style movies. Or movies that are made with the intention of someone's face getting blown off before I can anticipate it will happen. Lots of gushing blood, oozing intestines and bits of brain splatted about for fun are not my kind of fun.
What's in my DVD library, movies I watch once in a while for pleasure:
Matrix series (What IS real?)
Good Will Hunting
Pride & Prejudice
Gladiator (ok I look away for some of the spurty-blood scenes)
Fried Green Tomatoes
Riddick movies (esp the first one)
Bunch of animated ones:
Beauty and the Beast
Madagascar 1 & 2 (love those penguins!)
Shrek (always great for laughs)
There's more, but perhaps that's enough to tell a story ...