#4: “Here’s looking at you, kid.” — Casablanca (1942)
Humphrey Bogart actually ad-libbed this line while shooting a scene with Ingrid Bergman. Never written, it came out sounding warm and sincere from the heart.
provided by constative.com
This phrase encapsulated the romantic alchemy between Bogart and Bergman, thus cementing its place among the most endearing lines in Hollywood.