"You really can't tell?" Karyn asked, with a big grin on her face.
Jon looked around the room carefully. Everything looked exactly the same. Patting himself down revealed no changes either. "I don't see any differences at all." Jon said. "What did you do?"
"Amazing! Okay, I will give you a hint, I changed something about your body"
Frantically, Jon checked his crotch, fortunatly nothing had changed, he would have killed Karyn if she did something to his penis. Being reassured that the most important part of him hadn't changed, Jon made an invitory of the rest of his body.
After looking at himself every way he could in the mirror, he couldn't find anything changed. Of course, it would be easier to concentrate if Karyn wasn't rolling around on the floor laughing.
"Okay, Karyn, I give up, what did you change?"
Karyn finally managed to stop laughing enough to say "I wish Jon remembered how his body used to be before I made my last wish." Of course, the resulting shocked look on Jon's face was enough to start Karyn laughing again.