Dry & intelligent, usually. I'm fine with stupid humor, though. I hate stand-up comedy and its e-book counterpart (it gets to be the writer's platform for rantings). I seldom read any comedy, though it's my favorite sort of movie & TV show.
I like it when I say something in a group and only one person dies laughing. My best moment was at the work cafeteria a few years ago... there was something on the news about the oldest fossilized rabbit having been found in the UK. I asked if it was Welsh, and only the Englander in our group was laughing.