Casablanca was chosen by the American Film Institute as the greatest romantic movie of all time, and who would disagree? The movie also has some of the best romantic lines every penned: "Here's looking at you, kid" and "We'll always have Paris." It's the best story of romantic sacrifice ever filmed. Rick and Ilsa part for the sake of a better world — and there wasn't a dry eye in the house. The music that accompanies their romance ("As Time Goes By") helps to build the mood, and the pairing of Humphrey Bogart and Ingrid Bergman represents Hollywood star power at its mightiest.

Available for rental on Amazon Instant Video ($2.99)