I've seen this game in other groups and it can get pretty funny. Basically, you post making a wish and the person who posts after you grants it, but with a "corruption."
For example:
Person 1: "I wish I had a million dollars"
Person 2: Granted, but you can never spend the money on yourself.
Then, the person who grants the wish posts their own wish to keep the game going.
For example:
Person 1: "I wish I had a million dollars"
Person 2: Granted, but you can never spend the money on yourself.
Then, the person who grants the wish posts their own wish to keep the game going.