No recognition at all, other than a slight smiling wince at being called an old man... He had heard that before.

"Oh, this and that!"

The Doctor exclaimed cheerily as he strode into the room, running a hand across each bed rail as he passed it. This and that wasn't really a good description for what sort of Doctor he was but that was all Chazz was likely to get.

"I'm relieved to see they aren't bunkbeds at least. Have you been here long?"