This reminded me of one of my professors who is otherwise a great expert but extremely nervous, which results in constant waiving hands above his head, and nervous walk around the classroom. And he is of a small built and bald at the tip of his head, but otherwise have a bit long fuzzy hair, kind of looks like a mad scientist.
His nervous episodes used to distract me so much that I couldn't listen, so I used to make some facial expression like I was hardly into what he was talking, so after a while, since everybody else used to look down to their papers during his classes (it was either that with listening or my thing) he started teaching to me, and to this day whenever he sees me he stops me to ask me how I am and what I'm doing, he even congratulated me on my focus and attention during his classes not knowing that I was somewhere else in my mind all the time.
Great guy!