Maybe I'm Just Getting Old?

My college classroom today. A writer's workshop, 18 students. One of the things I put in my syllabus is a list of guidelines for classroom conduct, and one thing on the list asks them not to go in and out of the classroom during the class period. (Sometimes they just drift in and out at their whims.) One small, cute girl pipes up: "So how does going to the bathroom work? Can I just get up and go piss?"