Casablanca 

Casablanca is a film classic and so are some of its lines. This line wasn’t ad-libbed on the screen but actually came from a poker game. It’s hard to believe that this became one of the most famous lines in the movie.

The story goes that leading man, Humphrey Bogart, would teach costar Ingrid Bergman how to play poker on the set, during a break. Bogart said to her. “Here’s lookin’ at you, kid.” After it was heard, they couldn’t help writing it in.