Nothing happened. Jon realised that he had worded the wish slightly wrongly, so he said "I wish that for the next 24 hours Karyn and I would switch genitals, but no matter what happens, Karyn will think that she still has her female genitals and that I still think that I have my male genitals"
The rock glowed. Jon frowned. What had he just wished for..?
Meanwhile, Karyn sat on the bed. She was suddenly dying for a pee. She got up and knocked on the door. "Can I come out, Jon, I need to use the bathroom."
"Sure," said Jon and Karyn came out and went into the bathroom. She sat down on the toilet seat after pulling down her jeans and knickers. Her knickers took a while, as if they were caught on something, but Karyn managed to get them down. 'Strange', she thought.
Suddenly, a stream of urine emerged from her vagina - no, from five inches in front of her vagina - and sprayed the wall opposite her. She put her hands down in shock - there was nothing there, but the urine continued to spray. Slowly, it stopped to a trickle, and Karyn looked in shock at the large stain on the wall.
There was definitely something wrong here!