Portal 2 Easter Egg - Hidden Co Op Bot SPOILERS

At the end of the game you'll see GlaDOS and both co op bots, but if you play the chapter the itch and go to testing chamber 16 he says "I need an exit." So he mashes 2 test chambers together to make one. The thing is one of the must've been a co op testing chamber because if you zoom in to the other chamber really fast when he speaks, you can see the orange bot from co op. Be fast because he will run off. HAPPY HUNTING!