"I wish that at noon this Saturday whoever is holding this stone will transform into the person they hate the most and will stay that way for a week," Jon said. The stone glowed, granting his wish.
"There. Now to make it fair. I wish I would forget about ever making the previously stated wish and I would forget the idea of making it until noon Saturday when I will remember again."
The stone glowed and all memories concerning his transformation wish magically disappeared from his mind.