[Bobblehead]

I was taking a class (History of Mathematics - ZZZzzzzzzzz).

Everyday we would come into class and the prof would need to hit the switch to raise the (powered) screen at the front. One day, as he started writing on the front board, the screen started lowering. He looked shocked. He went to the switch and raised it again. As soon as he started writing again the screen came down again. Once more he raised it, but the screen would come down each time he started to write. Eventually he decided to call the class off. He never realized there was another switch at the back that someone was using to screw with him.

Then there was the prof who, a couple times a week, would teach with his cardigan inside out.

I swear, it is like some of the smartest people have their brain focused on their area of expertise at the expense of everything else.