"Listened to you?" The Master gave him a disgusted look, ignoring the question for the time being. "Whether you believe it or not, Doctor, I am currently the only thing standing between you and this House ripping you apart."

He held the screwdriver up, studying it for a moment. "It was a frightened, feral thing when I found it. No way to tell how long it'd been left alone without a Housekeeper to tend it, but do you know?" He grinned. "I think it had gone quite mad from all the waiting."