Directed by Roman Polanski
If you haven't seen this film and have NO IDEA about the plot twist, do not watch the clip. It's a classic film, yes and if you're even semi-film literate, you would probably know the twist without having seen it but still, it will have a bit more impact if you don't know. But this is a dark twisty neo-noir with combines the classic motifs of a film noir with more shocking and modern content. This film is often cited as one of the best screenplays ever written but its shocking ending was not concocted by the Oscar-winning screenwriter Robert Towne (who stormed off the set before the script was finalized) but rather Roman Polanski with some suggestions by Jack Nicholson.