Not Playing Games

Then, with a burst of inspiration, Jon said "Wait! Say something like ... um ..." Jon thought a moment. "Like *I wish the car was yellow* or *I wish Jennie was fully dressed*. Or ... I know, just say *I wish I knew the truth about the stone.*!" Jon looked at his mother to see what she would do. "You know, I really don't have time for your games, Jennie. Karyn is waiting in the car and we have to go. *Now*." "But, Mom." "Get dressed, Jennie. I'll be waiting downstairs." She left Jon's bedroom, taking the wishing stone with her. What was Jon going to do?