"Wheatley trailed off again, this time out of sheer shock. It was his turn to be speechless for a change, too astonished to do anything more than meet her grim, clear gaze." Blue Sky, Chapter The Rescue by Waffles
Wheatley and GLaDOS. Oh-oh and what if there is some sort of virus in the mainframe, that's why Wheatley went insane once he replaced GLaDOS and why GLaDOS felt remorse and freed you after she was turned into a potato.