Jon next tried again. "I wish that I would have blonde hair for the next five minutes."
He saw the confirm message in his mind, as well as the outcome.
Jon saw that his new life included blonde hair on his learner's permit and a half dozen other pictures. He saw images of himself dying his hair a different color for a Halloween costume. He saw his mother remembering when she was at the store to buy the notebook he needed, and thinking of a Jon with blonde hair. Then followed by another thought, and another, until he experienced what must be thousands of different slightly changed thoughts and memories of other people, all trivially altered for his new hair color.
"That's enough!" he yelled. "Stop that!" But it didn't stop. Karyn at the park seeing him with blonde hair, a grocer noticing him walk into the store with blonde hair--an unending stream of images that had all changed in an unimportant way.
The effect of the stone on his mind didn't stop for some time. But then, it cut off abruptly in the middle. Jon's guess was confirmed when he looked at a clock: exactly five minutes had passed. The stone hadn't run out of images of the new reality caused by wishing for a new hair color--it had only stopped when the five minute time limit on the wish had run out anyway and there would no longer be any effect.
Jon realized that that was a very unwise wish--now, what could he do?
