Lol this reminds me. First day of one semester in grad school. We were a class of approx 40 ppl taking classes together so we all knew each other. Fresman kid (probably) walks in and sits. Our professor starts the class. Guy remains sitting. He obviously has the wrong room, but i guess he was to embarrassed or confused to walk out. One pf my classmates had to tell him: look we know you are not supposed to be here. You have the wrong roon number.
THE PHONE IS RINGING!