I’ll start things off
2001 or, Dr Strangelove, by Stanley Kubrick
Aguirre Wrath of God or, Land of Silence and Darkness by Werner Herzog
Citizen Kane or, F for Fake, by Orson Welles
Amarcord or, La Dolce Vita, by Frederico Fellini
Eraserhead or, Lost Highway, by David Lynch
Day for Night or, The 400 Blows, by Francois Truffaut
The Godfather or, the Conversation, by Francis Coppola
The Battle of Algiers or, Investigation of a Citizen Above Suspicion, by Gillo Pontecorvo
Asteroid City or, The Grand Budapest Hotel, by Wes Anderson
Psycho or,The Birds, by Alfred Hitchcock
so many more. Yours?

Thanks Steve for posting! You are officially the first. More than ten is fine, but not over 100 please.
sneaky how I turned a top 10 into a top 20 😁