"Let go, Bill!" yelled an angry Kimberly. "You always think everything is yours. I wish you knew what it was like to be me!"
Bill immediately released the Grellstone and tried to take a step back... only he found he couldn't move. He felt completely paralyzed as the whole world in front of him suddenly melted--just dissolved away into nothing... no wait. Now it was coming back, fading away from nothing into... into his own face?!
Bill gasped, as he found himself looking at... well... himself. Only the gasp that emanated from his lips wasn't his voice. It was too high-pitched and girlish.
"Oh no," Bill said, recognizing he now had Kimberly's voice. "What's happened? I... I'm you!"
Bill looked down at himself and recognized Kimberly's black and pink t-shirt... only now it was on his body. He shuddered with disgust as he saw his sister's tiny breasts pushing out from beneath the shirt. He was wearing Kimberly's capri pants, her little pink ankle socks, and her favorite pink and black tennis shoes. He even had purple, glittery nail polish on his fingers now. And he knew he must be wearing her baby pink lipstick and stupid, glittery eyeliner too. Fortunately, because he was now Kimberly he was also the one now holding the Grellstone in his dainty, little hands.
"You're me!" laughed Kimberly, with Bill's voice. "How did this happen? Oh, this is hysterical. You're little Kimmy now. How's it feel to be a thirteen year old girl? Oh, I love this! I'm the older brother, now. I'm the big strong one and you're the weak little girly girl!"
"Here's what happened," sighed Bill, disgusted with his whiny, high-pitched girl's voice. "This weird emerald you tried to take from me is called a Grellstone... it's magic. It grants wishes, but somehow only if you're really angry or something. I don't know much about it, but obviously it works since you got all pissed-off and wished us into swapping bodies."
"Now wait a minute," said Kimberly with an evil smile on Bill's old face. "If I'm Bill... then that's MY whateverstone. It's only fair."
"No," said Bill. "You don't even know what it's called. And we're NOT staying like this. We are changing back this instant! I'm not spending the rest of my life as my own kid sister..."