Go down in the dungeon. Kill everything you meet. Backstab your friends and steal their stuff. Grab the treasure and run.
Admit it. You love it.
Munchkin is the mega-hit card game about dungeon adventure . . . with none of that stupid roleplaying stuff. You and your friends compete to kill monsters and grab magic items. Don the Horny Helmet and the Boots of Butt-Kicking. Wield the Staff of Napalm . . . or maybe the Chainsaw of Bloody Dismemberment. Start by slaughtering the Potted Plant and the Drooling Slime, and work your way up to the Plutonium Dragon!