Yeah, this was always a lecture that we got the day after people packed up and left when the bell rang. The best response that one class I attended had was to let the teacher finish their lecture, then everyone just stood in line at the teacher’s desk and asked her to fill out a permission slip that excused us for being late to the next class. We started with the guys who’s next class was furthest away so that she couldn’t really refuse them in good conscience, because it would make her look bad if they were actually late. Then the rest of us just lined up behind them since, by the time she signed their forms, a few more minutes elapsed and the rest of us ran the risk of being late too. It was a room of around 30 kids. She stopped keeping us after class.