"The rock was in your hand and nothing good came of it for either of us," continued Jon.
"You idiot," said Sarah. "You call me an idiot and look what you did?"
"Oh, no, I..." said Jon. "Wait, I still have the stone. I remember now. The wish ends when the breath is over. I can't end a sentence with those words, then stop, then start another sentence and have it be a wish--it won't do anything."
"I think you lost any right to complain. I don't understand what you just said but you obviously can't be trusted with that stone. Fix me and give it to me!"
"No," said Jon.
"Don't you owe it to me to make up for the trouble?"
"Like hell I do!"
"Don't you owe it to yourself? You're my twin. Which means the only way to get rid of your oversized breasts is to get rid of mine!"
"That's silly..." said Jon. But he really didn't know. "Fine," he finally decided. He pointed the shrink gun at Sarah's breasts and shrunk them to Sarah's natural size. His own didn't shrink, however. Of course, twins could have small differences--maybe one of them got a breast reduction or expansion and the other didn't, for instance. Sarah was just lying, or making things up.
Jon pointed the gun at his own chest and shrunk his boobs, then changed a setting and shot out a beam--only it wasn't a beam, it covered an area. Both he and Sarah started shrinking. Six feet was a bit tall for a woman; after a six inch reduction, he turned the device off and immediately began a wish...
... just in time to prevent Sarah from trying to take the stone. "I wish you'll let me keep this stone!"
"Fine, I don't want it anyway after all the trouble it caused!"
But that wasn't Jon's last wish....