ok its simple, first someone makes a wish, the next person that posts says wish granted, then corrupts it, then makes their own wish.
Example:
I wish I had a girlfriend.
next person) Wish granted, but she's a toothless crackhead who steals your money & answers to the name Bertha.
*your wish here*
And so on....
I'll start...
I wish I could have a private Paramore show in my backyard.