Scooter polo. I originally got the idea form bicycle polo. You can go here to learn about it. I have warped/twisted the rules and made my own. This is a really fun project to try over the weekend with some friends, and it is really cheap.
Step 1: Rules.
1. To hit the ball you must have two feet on the scooter deck
2. No physical contact (That includes hitting mallets)
3. No goalies
4. You can't kick or push the ball with your foot buy it is ok for it to touch you scooter
5. Have fun