Humorous conversations to overhear

As my wife and I are leaving Borders, a man in his forties comes up to the register that we had just left. The elderly cashier looks at the first book that the man hands her, and remarks, "Ooh, this is a good book. Hard, though."

The man responds: "Because of all the words?"

It turns out that it was some sort of puzzle book or brain teaser set or something, but this exchange was definitely good for a double take and a laugh.