The Nightmare Button

Last night:

I was sitting in class. Mr Scott was once again our Form Teacher. Everyone was talking animatedly to those beside them.
Alone on the far side of the room, I slouched in my chair and looked at my desk.
There was a big, shiny red button.
Each desk had one of these buttons. Out of boredom I pressed it multiple times.
Suddenly, a siren sounded.
I jumped and ran to where Bobbi, EJ, Andy, Alex and Chloe were.
That button just so happened to be the Nightmare Button. A memory jumped into my mind. Mr Scott had explained to us that that button was only to be pressed when you were having a nightmare, and the Nightmare Uniform was to be worn at all times. The Nightmare Uniform happened to just be a green rugby jersey, worn under our school uniform.
The siren was blearing and Mr Scott quietened the class.
"Whenever the Nightmare Button is pushed, school ends early."
So we all milled outside and readied ourselves to go home.
In the corridor, EJ turned to me,
"I need to visit the boys bathroom." she said, as if it was a completely normal thing to do.
"Good luck," Bobbi replied as EJ went into a bathroom.