"You didn't ask me to..." That tidbit catches Rodney by surprise, and he looks up from the guts of the machine to blink at his guest. He repeats, "You didn't. Huh." Well then.

Regardless, "I would warn you off from looming. I have--I have sharp elbows." That seems like a threat enough. "Just because I'm immune doesn't mean I like it."

He dumps his tools beside his project and sticks out his hand. "Doctor Rodney McKay, Phd, Phd. I'm not entirely sure it's a pleasure to meet you, considering the hour and the coffee. But I can't be bothered to come up with any proper pleasantries, and anyway you're here regardless."