First of all, as is apparently the case with all old school computer scientists, they can't type. They also love to code in front of the class, so you end up watching this painful process of them trying to type, "ci...-l...e...x..a.mp...l...e.c" (the exception to this is that they have this twitch ability to type ls sporadically, for no reason although they do typo that quite often). When they are typing someting besides ls, they look straight down at the keyboard.
Now, nobody in the class wants to be the one to shout out to make some little correction to his typing, so the best part is when he's typing:
pirntf("Age: %d Weight: %g Sex: %a\n",student.age,student.weight,student.sex);
then when he finally looks up, he has to use the left arrow to scroll all the way back to correct it (if not the delete key).
great fun!
I now know profs at at least three schools like this, does anyone else know what i'm talking about?