Customer: “I’m looking for a book.”

Me: “Were you after a particular book?”

Customer: “Yeah.”

Me: “What was the title?”

Customer: “I can’t remember.”

Me: “Do you know who the author is?”

Customer: “No.”

Me: “Do you remember what it’s about?”

Customer: “I saw it recently…”

Me: “Can you tell me anything at all about it?”

Customer: “It had a nondescript cover.”

Me: “…”

(And I found it!)