John suddenly had an idea. He went to one of the giggling blondes he had created and asked, "Could you pull down that red thingie for me?"
"Like, sure!" the agreeable airhead said and triggered the fire alarm.
Everyone scrambled out of the building amid much screaming. John saw his opportunity and ducked into the teachers' lounge and used it's connecting door to get to the office. He flipped the switch to 'off' and sighed in relief.
The giggle-girl he had provoked could not explain herself and got into trouble, but John was free and clear.