The Doctor sighed. Sometimes, he wondered why he bothered, but he knew he would never stop bothering.
"Suit yourself," he said, in a tone that clearly said the discussion wasn't really closed. He glanced along a side-street. "I think there's a market down here. Come on."
As he walked, he started, very subtly, tapping his fingers against the side of his leg. Just to see what sort of reaction it got.