This is one from when I was in school, so I wasn't a dev but it made me feel like a CS student badass.

A class mate and I were having a discussion about his study habits. Basically he was freaking about the mount of studying he was going to have to do for this class:

Me: dude, you need to relax. You'll do fine.
Classmate: no, have you seen the amount of work that is on the syllabus? The size of the book?
Me: wait you bought the book? Also we took this same professor for several classes. His syllabuses are always huge. What did you get in the prereq to this class?
CM: an A.
Me: there you go.
CM: but I had to study all the time. I had no free time.
Me: really? I had an insane amount of free time.
CM: what did you get?
Me: B+.
CM: See but I did better than you.
Me: yeah . . . but I had fun last year.
Professor: you know, it's hard to tell who is the better student. The one that had no fun, but got an A. Or the one that had a lot of fun and got a B.
Other Classmates: probably the guy that got the B.

Hurray for peer and professor validated laziness.