What do these famous cultural references have in common? The fifth episode in the first season of the 1960s television show Batman, which introduced Cesar Romero as the Joker; the Agatha Christie short story, Swan Song; the Marvin Gaye song, (I’m Afraid) The Masquerade is Over; the 1970 hit by Smokey Robinson and the Miracles, Tears of a Clown; the...