This game is simple. First you say something you wish for (anything, selfish or not). The next person says "granted, but..." then you give some reason why their wish is bad. You also say your wish for the next person. Example:
Me: I wish for a giant pillow.
Person 1: Granted, but the pillow explodes when touched. I wish for 1 million dollars.
Person 2: Granted, but the money is all fake. I wish I could fly.
Person 3: etc...
And so on...
Don't tell me the sky's the limit when there is footprints on the moon.