I watched Casablanca once and I don't know what was wrong with me in comparison to the world raving about it -- I found the movie dull and confusing. :)
I think they also made a movie based upon "Hitchhiker's Guide" - - I enjoyed the movie. I never read the book.
I had occasion to look this up a number of years ago:
In the 1942 film classic Casablanca, Richard "Rick" Blaine (Humphrey Bogart's character) never says "Play it again, Sam." There are two exchanges that come close. The first takes place between Ilsa Lund Laszlo (Ingrid Bergman) and Sam (Dooley Wilson). Ilsa Lund: Play it once, Sam.