Did Humphrey Bogart really say "Play it again Sam"? And what movie was it in?
In fact, nobody does.
There are two exchanges that come close. The first takes place between Ilsa Lund Laszlo (Ingrid Bergman) and Sam (Dooley Wilson).
The second takes place between Rick and Sam.
It's been reported that "play it again, Sam" originated in the 1946 Marx Brothers film A Night in Casablanca, but we can't confirm that, not having seen the film ourselves.
For more movie history and information check out the Movie channel at infoplease.com.