As Karyn quickly made her way to Biff's house, Jon (or rather, Boopsie) reconsidered the fact that he had nothing more to wish for. Oh, he was satisfied as far as his life with Biff was concerned, but during his time at the high school (and definitely before he began dating Biff), he remembered being ridiculed for his gayness and he wanted to use the stone to teach those people a lesson.
Specifically, Boopsie thought of ...
