Jon gave the stone a good, hard look as he was putting it away.
"You know what?" he said. "I can make one more wish today. Maybe Karyn will thank me for this tomorrow." The boy closed his eyes, trying to make sure he worded this wish correctly. "I wish that tomorrow during Sarah McMillan's gym class, that she would be granted one wish, but that the wish she makes would serve specifically to embarrass her."
That would ensure that there was drama, and that Karyn would have a front-row seat to watch it go down. Jon smiled, then put the stone back into its box, and got ready for bed.