"Certainly."
"I know the original of that picture."
"Young man, you lie, and you need not come here with any such wild story. Hark you, I have but to give an alarm—touch a button—and I will have a whole platoon of police here."
"You do not need the police."
"How do I know?"
"I will convince you."
"You will convince me?"
"I will."
"Do so."
"I repeat, I know the original of that picture."