Tennis

Looking at the poster you see that try-outs are that evening. Deciding to go, you move on with your day.

School is nothing special. Class, class, class, lunch, free block, class, class...

In your last class of the day, you get a pass to run to the bathroom. After you...clean the pipes, you zip up your pants and move to wash your hands, when you hear a strange noise from one of the stalls. Assuming it's just someone else in a stall, you ignore it, but then you hear another noise. Then another. Wait--is that 2 voices? Is someone having sex in there?