Factotum includes some of the best dialogues the man has written, imho.
"I'm a writer temporarily down on my inspirations."
"Oh, a writer, eh?"
"Yes."
"Are you sure?"
"No, I'm not."
"What do you write?"
"Short stories mostly. And I'm halfway through a novel."
"A novel, eh?"
"Yes."
"What's the name of it?"
"'The Leaky Faucet of My Doom.'"
"Oh, I like that. What's it about?"
"Everything."
"Everything? You mean, for instance, it's about cancer?"
"Yes."
"How about my wife?"
"She's in there too."