The last one got old. Example of the game is shown below:
User 1: I wish I had a lifetime food supply.
User 2: Granted, but most of it goes bad. I wish I could fly.
User 3: Granted, but you later fall. I wish for... (Well, you get the idea)
Let's start. I wish for the SML mystery to be solved.
Edit: New rule: Saying things like "Granted, but it did" or something like that isn't even corrupting the wish, but is rather being lazy. Games like these should be more entertaining than that.