Outside the school, after Biff put Boopsie down next to his car, he reached inside his pocket for the wishing stone and took it out.
"Look what I've got, baby," Biff said, holding up the stone in his hand. "I know you said you couldn't think of anything more to wish for to make your life any more perfect. But how about a wish for someone else? There must be someone at school whose life you'd like to change or improve." He placed the stone in Boopsie's hand. "Go for it, babe."
Boopsie giggled, then said "Okay, yeah, I think I can, like, think of something. Hmmmmm ..." He paused for a time, then giggled again. "Okay, I think I, like, got it." He took a deep breath, then said "I wish ..."