What Jon failed to understand was that his original "something interesting" wish didn't just change Sarah and five other cheerleaders, Gladys, and Karyn ... it was bigger and much more dangerous than that. His wish had created small pockets of unstable reality around town. And these areas of instability were easily malleable and, with just a few simple words, could be changed. Some of the changes only affected the present (like Gladys and the cheerleaders), but others affected the past (like Karyn, who was never Jon's friend in this newest reality).
By wishing yet again for "something interesting" (this time specified at school), Jon was increasing the size of these unstable areas of reality and causing them to pop up more frequently. Up until now, he was so incredibly lucky that the weakening of reality didn't tear a hole in the fabric of space-time, but with this newest careless wish, the chances of that happening were, unfortunately, much greater. All it took was for someone to dismissively wish or hope that the world would end ... and it would happen.
Fortunately, though, after a day or so, reality would become stable again, but what were the chances that nothing would change in that amount of time? Not good, that was for sure. And Jon found out firsthand how not good it could be, since at the end of the next school day, he ...
