Just then, Jon noticed a dull gleam from the end of the hallway, where it intersected with another hallway. He quickly ran down the hall and grabbed it. His makeshift toilet-paper underwear was starting to unravel, just as one of the classroom doors opened up. Jon panicked, and said:
"I wish I was somewhere private!"
There was a brief flash of light, and Jon's toilet-paper underwear floated gently to the floor in the now-empty hallway as the students started to leave the classroom.
Meanwhile, Jon found himself in the locker room. Specifically, he was in the showers. He breathed a sigh of relief as he saw there was no one around. He looked down and noticed that his toilet paper underwear had vanished, but he decided that he could just "borrow" someone's clothes, if he could get into one of the lockers. He walked out of the showers and into a chorus of shrieks and screams.
Too late, Jon realized that he was in the girls' locker room, and he rounded the corner just as the girls were stripping down to take their showers at the end of their gym class.