Casablanca (1942)

Casablanca (1942) defined the template for every doomed love story that followed, with its battlefield romance between Humphrey Bogart and Ingrid Bergman earning a 99% approval rating on Rotten Tomatoes from over 130 reviews. Its dialogue remains the most quoted in cinema, featuring lines like "Here's looking at you, kid" and "We'll always have Paris," while its ending is the most debated sacrifice in romantic film—chosen by the American Film Institute as the #1 romance of all time. This iconic status surpasses the average romantic film's cultural impact by a factor of 10, ensuring its legacy endures 80 years later. 30% lighter than the runner-up's runtime by 8 minutes, it packs extraordinary depth into 102 minutes.