I had a horrible moment my senior year in college. I was taking a numeric analysis course, required for my computer science degree, and the closed-book takehome required us to do an integral. I came up to the teacher and said "I'm not going to look at *your* textbook, but can I please look at my freshman textbook to remind me how to do an integral?" He was bemused that anybody could forget calculus but gave permission.

Analysis of algorithms, however, I continued to understand well after I left college; nowadays I can still look at something blatant and say "Who, that increases geometrically, that ain't good", although I certainly couldn't take an arbitrary piece of code and determine what the constant was.