"Yes, I'd prefer a private pat down."
"All right, sir. Please step this way."
Once in the room, choose from one (or more!) of the following as an ice-breaker:
"Can I lay down for this?"
"Boy, am I glad I shaved my butt today!"
"Can I video this with my phone?"
"Why don't I just save us all some time and take all my clothes off?"