Munchkin is a card game that pokes fun at dungeon crawling. you can be a dwarf, elf, or halfling warrior, wizard, cleric, or thief. It's a very silly game in which you can completely stab your buddy in the back (and is encouraged!) There are many different genres, too, like cowboys, cthulhu, superheros, ninjas, vampires, and pirates.
It's a great way to spend a few hours with friends.