2 rules
1. don't post twice in a row
2. horribly mess up the last persons wish, then make your own.
Example:
Person 1: I wish for a cookie!
person 2: Granted, but the cookie monster does a drive by on your for it. I wish for.....
edit: you're suppose to granted what ever they wish for and mess it up, not just denie it. unless you do it in a horribly funny way.
I wish for a mountain dew.