" yet nondescripts, thought Harriet, were the most difficult of all human beings to analyze. You scarcely knew they were there, until—bang! Something quite unexpected blew up like a depth charge and left you marveling, to collect strange floating débris. "

― Dorothy L. Sayers , The Lord Peter Wimsey Collection 3: Murder Must Advertise / The Nine Tailors / Busman's Honeymoon