One time at school we royally pissed of our professor (small uni, only 8 kids in class). So he wrote down all the lecture notes in a record 2 minutes and walked out of class. The punchline was he had terrible handwriting and none of us could read what he wrote, so when he quizzed us over the notes (next class) we all failed in epic fashion
I once had a professor that wrote on the blackboard with one hand and erased it with the other, and to make it worse what he was saying wasn't even on the board. I mean the guy had talent but it was a pain in the ass!