I wasted some serious time last night playing Viva Caligula, one of the newest games to come out of the insanity known as Adult Swim.
The point of the game is to kill a ton of people, while collecting all 26 weapons (one for every key on your keyboard) and then you can go to the orgy! There are a ton of crazy ass weapons like an axe, pitchfork, hive of bees, ocarina, necromancer powers and a whole lot more. You also go into a RAMPAGE mode, where you blow people when you hit them. Talk about awesome. Plus the character designs are really great as well.
So hurry up and go waste some time!