Uh oh. This could go very, very bad. He had no idea that GLaDOS didn't remember any of his little rise to power from before and what happened after. In hindsight he should have, otherwise he would have been crushed like a bug right then and there. He just decided to play it cool. He cleared his throat(?), and in a thick, fake Texas accent, he said, "Uh, sorry missy, you must have me mistaken for someone else."