Then the next poster must grant that wish but corrupt the result, then post their own wish.
For example:
Poster#1-
"I wish I could fly!"
Poster#2-
"Your wish is granted but you where a halo now..."
"I wish I had a cookie."
Poster#3-
"Granted, but you already ate it."
"I wish..."
My Wish:
"I wish I had a puppy."
"I wish I had a puppy."