Co-written by Julius and Philip Epstein and Howard Koch, the screenplay to Michael Curtiz’s 1942 film Casablanca is widely regarded as the greatest of all time. In 2006, the Writers Guild of America voted it tops in their list of the 101 Greatest Screenplays. However, Rick Blaine’s (Humphrey Bogart) remark to Ilsa Lund (Ingrid Bergman) at the conclusion of the film, “Here’s looking at you, kid,” was not in the film’s screenplay. Rather, it was an in joke between Bogart and Bergman—he used to tell her this constantly as he taught her poker between takes, and it somehow made its way into the film. It was later voted the fifth most memorable line in film history by the AFI.