"Oh, Jon," his (or rather, her) mother sighed as she walked down the stairs, "Karyn and I were just having a little fun with you. We weren't going to keep you this way."
"You wouldn't have to!" Jon yelled. "With all the accidental wishes you make, you could get me stuck as a girl even without intending it! Now give me the stone!"
Her mother paused. "That's enough of that tone, young lady!" she snapped. "You don't see Karyn acting like that toward her mother, do you!? God, I wish you were a nice girl like her!"
Jon could only gape in horror at the words "I wish." By the time her mother realized what she'd just said, the wish was complete and suddenly Jon was a nice girl like Karyn: a pleasant, if tomboyish, heterosexual seventeen-year-old girl.