"Perhaps, but you wouldn't."
"Why not?'
"Because you're a gentleman."
"Oh, am I?"
"Yes. Or if you aren't you ought to be."
He frowned at that, a little puzzled.
"Where do you come from?" he asked.
"I can't see how that can possibly be any business of yours."
"H-m. How did you get in here?"
"I followed my nose. How did you?"