I’m not sure what you mean by stumbling on old movies. If you’re asking about my discovering obscure but great old movies that I didn’t watch because I wasn’t even born then or was too young to watch older movies, I would have trouble coming up with them. If you’re asking about films considered classics that I missed from the same period, it’s easy to come up with them. I watched few films until just after I graduated from college. Here’s a list of some classics that I didn’t watch until then and now like a lot:
The Adventures of Robin Hood (1938, U.S., dir. Michael Curtiz)
All Quiet on the Western Front (1930, U.S., dir. Lewis Milestone)
Amarcord (1974, Italy, dir. Federico Fellini)
Army of Shadows (1969, France/Italy, dir. Jean-Pierre Melville)
Camille (1937, U.S., dir. George Cukor)
Casablanca (1942, U.S., dir. Michael Curtiz)
Citizen Kane (1941, U.S., dir. Orson Welles)
Dr. Strangelove (1964, U.K., dir. Stanley Kubrick)
Duck Soup (1933, U.S., dir. Leo McCarey)
Freaks (1932, U.S., dir. Tod Browning)
The Great Dictator (1940, U.S., dir. Charles Chaplin)
It’s a Wonderful Life (1946, U.S., dir. Frank Capra)
King Kong (1933, U.S., dir. Merian C. Cooper)
La Jetée (1962, France, dir. Chris Marker)
La Strada (1954, Italy, dir. Federico Fellini)
M (1931, Germany, dir. Fritz Lang)
The Maltese Falcon (1941, U.S., dir. John Huston)
Modern Times (1936, U.S., dir. Charles Chaplin)
Psycho (1960, U.S., dir. Alfred Hitchcock)
Ride the High Country (1962, U.S., dir. Sam Peckinpah)
The Searchers (1956, U.S., dir. John Ford)
Seven Samurai (1954, Japan, dir. Akira Kurosawa)
Singin’ in the Rain (1952, U.S., dir. Gene Kelly, Stanley Donen)
The Third Man (1949, U.K., dir. Carol Reed)
The Treasure of the Sierra Madre (1948, U.S., dir. John Huston)
Vertigo (1958, U.S., dir. Alfred Hitchcock)
The Wild Bunch (1969, U.S., dir. Sam Peckinpah)