I had one math prof at the uni who would always be hidden in a cloud of chalk dust because he got all excited and hit the blackboard so hard. He used to yell at students how stupid they were if they didn't know an answer and he used the term "obsolete" a lot.
Tell Debussey about it (well, you have told Debussey about that guy before
). Debussey only managed to learn to count from 1 - 10 before the school authorities refused it to take any more math classes because it lacked the intellectual capabilities to learn it, but even back then the math teachers had an aura of weirdness about them.
That class gave you a lot of laughs, didn't it?
And hopefully you got an A?