Zombies. It’s the sickest, silliest Munchkin yet.
The players are zombies, kicking down doors and eating brains.
The “monsters” they’re attacking are people, some helpless and some hazardous, with a few rogue zombies thrown in.
The armor is whatever they’ve blundered across during their lurching search for brains.
So bravely the munchkins go forth, with mousetraps on their feet and a bowling trophy protecting their poor rotting heads to level up, or to die again.