I was talking to my mentor at work a couple of weeks ago and was telling him about a some of the statistics stuff I was doing for the Performance Regression Prevention System analysis tools. In the course of my explanation I drew a bell curve on his whiteboard (as mathematicians, statisticians and physicists are wont to do). He was very impressed by how well I drew the curve freehand.
I guess that's thing I learned at university that I never really thought about. I wonder if I can still draw Zeta and Xi. I remember the first time one of our lecturers drew a Xi on the blackboard at university - half the students didn't believe it was a real Greek letter.
Talking of alphabets, Wikipedia has some fascinating articles about obscure/old alphabets and characters.