When Jon got home from school, he took the stone out of its box and wondered something. He had always wanted to know if things would be different if people were different. In other words, if Karyn's personality were switched with Sarah's, would Karyn still be friends with Jon, or would Sarah be friends with Jon?
Now he could find out, with the wishing stone.
He held it in his hand and said "I wish that for the next seven days ..."