As they kissed, Jon became aware that everything was eerily frozen, the people around her, the wind had stopped blowing, everything.
Then it occured to Jon she was in real trouble as huge, white backwards letters hung in the air in front of her. If she could see them the right way round, they would've spelled "The End" right there in front of her.
It was at this point Jon's eyes went wide as she realized that her careless wish had changed reality into a movie, and an ending movie at that.
"Stupid, stupid, stupid..." She thought to herself as the world faded away, leaving her in an empty black void.
Somewhere the credits were rolling...