Some games are daft.
Some games take your favourite childhood cartoons, and extra-cartoonify them. Fight with Katanas, Nunchucks, or even pizza, whatever gets you to level 10!
Some games encourage you to backstab all of your friends, make silly jokes, puns, run like a coward, and sometimes even cheat.
That's your basic Munchkin. It's all gravy if you can get away with it!