This Cake Is Great, a Portal fanfic, it's a lot of fun.
Quote:www.fanfiction.net/s/3944611/1/
in contrast, GLaDOS's thoughts boomed overhead the whole way. Sometimes she mused on things like the shapes of spots on the wall; usually, she amused herself by telling Chell the way ahead was clear, when in fact the way ahead was lined by uselessly apologetic turrets. It amazed Chell that a computer could be so humanly cruel and introspective. She even began to pick out emotions in the voice that had initially seemed so impassive.