I had one professor I thought was unfairly difficult. I remember him lecturing a girl about how she was failing his class because she spends too much time talki

I had one professor I thought was unfairly difficult. I remember him lecturing a girl about how she was failing his class because she spends too much time talking on the telephone. Note - I never once saw her use her phone during class. The tests didn't seem to be related to what was covered, or what was in the exercises, or even the test questions at the back of the chapter. I think he left a few semesters after my class. If he was fired, it would say it was justly so.