Casablanca – “Here’s Looking At You, Kid”
If one had to find one line to represent the Golden Age of Hollywood, it would probably be Humphrey Bogart’s “Here’s looking at you, kid” from Casablanca. It turns out this line, like many great ones in cinema history, was unscripted. The crew had been rushing to finish the script and Bogart helpfully delivered an iconic bit of improvisation right on the spot.