"No, but I just thought of one about us," said Alan. S/he took the stone from Jon. "Here goes... I wish that the reason we're female is that we were experimenting with a sex-change ray, which you have attached to your keychain."
"I never thought of that." Jon reached into his pocket for his keys. "Let me see if that worked..." Sure enough, there was a strange flashlight attached to his keychain. It had a blue and a pink button, whose functions were easy to guess.
Jon pressed the blue button and blue light came out of the end. The light wasn't focussed, but Jon found he could narrow the beam using a handy dial. When he shone the beam between his legs, he felt a familiar feel and an astute observer could see a male bulge return to his pants. "Ahhh... I'm me again."
"Try that on me," said Alan, handing the stone back to Jon.
Jon shone the light between his legs.
"Ahh... that feels good. Now we just need to worry about Karyn."
"Yeah, it should be easy, just wish her back... but wait a minute. What's the reality like where Karyn is my friend?"
"What do you mean?"
"Well, for one thing, are you my friend?"