@element[0] said:
Also in his list of annoying habits was printing out source code, a lot of source code, and then sitting there with a highlighter looking at it for hours?WTF!?!1
There's nothing wrong with that, as such - it can be an entirely valid debugging technique, particularly when doing a full test might have some sort of cost or difficulty involved or may not be able to cover all the edge cases. It can also be useful when you want to grok large amounts of someone else's code.
That said, neither of these circumstances seem to apply here.