Most people in my computer science classes were ultra-nerdy. Like, running shoes, dress pants, a dress shirt and one of those <a href="http://www.wellingtonsurplus.com.au/images/m/CT0430.jpg">puffer vest things</a> nerdy.
I had this one calculus lecturer in my third year of calc who refused to use any visual aides to his lecturing. He had an overhead projector, a projector hooked up to a computer and nine blackboards (literally), at his disposal, yet all he did was pace back and forth at the front, speaking calculus, without a microphone. He also had a rule of "if I hear your cellphone, you leave", and on more than one occasion stopped the class for over half a lecture until somebody left out of frustration.
