It's the World of Dorkness!
The Munchkins are now vampires, werewolves and changelings. Bash through the haunted house and slay the monsters – the other monsters, that is. You can't slay your fellow munchkins, but you can curse them, send foes at them, and take their stuff.
Munchkin Bites! is a standalone game, which can be combined with other Munchkin games.