The dumbest thing you think is funny
Slapstick. Why oh why is that funny when it's often mean, at least in real life? But it is.
Some dirty jokes. I don't think I'm supposed to admit that.
Black humor. I'll have mine black and strong, thank you. But that's not dumb necessarily. Still, not everyone's taste but I freely admit it!
Jokes a 5 year old would like. Don't know why!