It Happened One Night - directed by Frank Capra with Clark Gable, Claudette Colbert etc. The first film to win all 5 major Oscars( this was only repeated in 1975 by One Flew Over the Cuckoo's Nest and in 1001 by The Silence of the Lambs)
Casablanca (movie) Starring Humphrey Bogart, Ingrid Bergman, and Claude Reins. Amazing film about past lovers meeting again by chance in unfortunate times during WWII. Classic film that will always be a favorite! "Here's to lookin' at you, kid.