Ok, when I was at dinner tonight, a couple of friends and I played this game on the back of a kids menu. What you do is you split a piece of paper into 3 sections. Independently, people draw in the different sections. The goal is to come up with a character without seeing the other two parts. One person does the head, one person does the body, and one person does the legs. The way that you will know they match up is by making lines from the neck go from the top section to the middle, and lines from the waist section to the bottom section.
We came up with some really weird stuff. I think this would be good to do in vector format (either flash or Illustrator) and not with much color detail, IE no intense shading. We came up with some really weirdo characters. Would anyone be interested in starting a battle like this?