Originally Posted by Freebase Dali

Me too!
The feeling you get when you find one... it's like you won a car on The Price Is Right or something. I don't know what it is, but there is gratification in knowing that you found a mistake that a professional copy editor did not.

You find a typo in a book... then just idle on the offending word thinking "Heh... I totally found your ass. You couldn't escape my superior gaze. These guys should hire me instead."