How do you play Calvinball in Calvin and hobbes?

The rules for Calvinball are simple:

1. Wear a mask.
2. Use a volleyball as the "Calvinball".
3. Make up the rest as you go along.
4. Never, Never, NEVER use the same rule twice.

Or to put it in Calvin's Words:

Other kids' games are all such a bore!
They've gotta have rules and they gotta keep score!
Calvinball is better by far!
It's never the same! It's always bizarre!
You don't need a team or a referee!
You know that it's great, 'cause it's named after me!