4. “Here’s Looking at You, Kid” – Casablanca (1942)

One of the cinema's most oft-quoted lines was never written. Humphrey Bogart said the line casually during rehearsals to Ingrid Bergman; the director loved it so much that he used it in the final cut. The line is repeated a number of times throughout the film and has a sweet, yet bitter quality that speaks volumes for the romance between Rick and Ilsa. This makes the improvised dialogue by Bogart so charming. Sometimes, when actors are free to play, magic happens.
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Edited by Zainab Shaikh