My criminal law professor, ~5 minutes into day 1 of class: “Now I noticed today that several of you came to class late. And based on my years of teaching experience, I know that on any given day of class, 6 or 7 of you will show up late. I’m telling you right now that if any of you are late to class again, I am apt to throw a temper tantrum. When you come late, it’s extremely disruptive, and I completely lose my train of thought. So unless you run into some sort of emergency, there is no excuse to be late.”
My criminal law professor, ~2 minutes into day 2 of class: “I noticed that a few of you were late today. I warned you on the first day of class that I am going to throw a temper tantrum. It is happening now. DON’T FUCKING BE LATE TO CLASS. IF YOU’RE GOING TO BE LATE, DON’T SHOW UP AT ALL.”
The result is that I now run on law professor time, which means that I am chronically 5-15 minutes early to all scheduled events and fume while waiting for all the normal people to show up 10 minutes late.