Testing the rock.

For Jon and Karyn, it was the longest school day ever. Jon had left the rock at home so it wouldn't fall into the wrong hands, and now they were rushing over to Jon's house to see what it could really do. "I've been thinking, Jon," Karyn said. "Yeah?" he replied. "Yeah. Well, the wishes are permanent, but what if we added something like a time limit or a keyword for the wish to reverse itself. That way, for the wish to work, it'll have to follow all of the conditions." "Well, there's only one way to find out..." he was about to say those two magical words when Karyn interrupted. "Can I try, Jon? I've been thinking a long time about this, and I'm sure I won't screw anything up this time." "I suppose," Jon said, reluctantly handing the rock to Karyn. "Okay, I wish..."