Sarah watched as Jon left his bedroom and then went downstairs. She didn't go downstairs herself, but heard Jon's friend Karyn come in.
"Hi, Karyn," Jon said to her.
Sarah smiled. She could mess up Karyn, just like she did for Jon.
"I wish that Karyn wouldn't be able to hear any sentence I start with the words I wish. And I wish that she had never heard of the wishing rock."
The rock glowed. "Now, for one more. I wish that any changes I make to Karyn, she will notice and she will prefer each of them to how she was before."
The rock glowed again and Sarah walked downstairs to "greet" Karyn.