[Flippantly] Oh yeah, all the time. And, well, the other one wasn't quite new, though he thinks he is. Or maybe he actually is. Sometimes it's difficult to tell... [He pulls a face as he trails off for a moment.]

Anyway! I'm the Doctor. And you are...? [He holds his hand out. If Derek can feel such a thing in a handshake, he just might be able to feel the Doctor's double heartbeat.]