Okay, I played this game on a different Forum site with some other friends and it was really fun. And most importantly, its basic and simple! All you do is corrupt the person's wish above you then make a wish of your own. The only rule is is that your corruption has to involve the persons wish.
Example:
Person 1: I wish I had more cash.
Person 2: You are fired from your job and become a pennyless loser.
Then person 2 will make a wish and it goes on x3
I shall start.
"I wish I could fly."