Reginald set the stone down and stripped out of his clothes. He then stood in front of a full length mirror he had bought just for the occassion. He picked up the stone and said, "I wish I was 20 years old."
Reginald felt disoriented for a moment. Suddenly, he was somewhere else. Damnit! The rock's gone too, he thought, looking at his hand. Wait a second, the nails...were...painted...
Reinald looked in a mirror, apparently, he had swapped bodies with a 20-year-old woman...wish fulfilled...