Without fail the class would end a few minutes early. As soon as I started making the sounds it was like dominoes. Ten minutes left in the lecture but everyone has all their stuff put away and are putting their coats on. I think of this often. May this knowledge set you free a few minutes early.
All of my classes were pretty great, I wanted to stay and learn at most of them. University was interesting, I miss having access to the professors and the ability to talk to people in very different disciplines.