This is another classic forum game, though one that is far more conventional than the "pants" game. To start the thread, I will post a wish. The following poster then makes it come true, but corrupts it in some way so that something bad happens. Something like the genie trope where the genie goes out of their way to make the wish backfire. After the poster corrupts the wish, they then post a wish of their own, and the next poster repeats the process. I wish I had a watermelon.