I'll be honest - I'm not a big fan of "funny" games.
Now, that's different from "fun" games, which is kind of a pre-requisite for the genre; if you don't enjoy playing a game, it's probably more of a sport.
And, I'd say it's different from a game that is "humorous". Munchkin has plenty of funny cards in the game, but it's still a proper game.
What bugs me are party games that try a bit too hard to BE FUN instead of being.. entertaining is probably the word I'm going for.