Jon sat at home, thinking. "Hmmm, I'm bored. I wish something interesting would happen." he said while holding the stone. "Uh oh, what happened?" Jon asked.
Jon thought desperately... What could he do?
"I wish Karyn had been here long enough to hear my previous wish." He said, this way at least whatever happened he'd have someone with him who knew the way things should be.
Karyn appeared sitting on his bed looking very confused, because of the way Jon phrased his second wish she heard both of them, she had dual memory of the last several seconds, one where she was sitting at home watching TV and one where she was sitting on Jon's bed and he'd just made two wishes. As the memories resolved themselves inside her head she processed what Jon had said in his first wish.
"Jon you idiot!" She shouted.