Mystery in drama is crucial and the questions drive the narrative. Conflict then drives resolution and resolution brings satisfaction. So what about the films that do not provide all the answers?
Ambiguity poses curiosity. "You wanna know how I got these scars?" asked the Joker. No we don't. Imagine the kids in 1983, with no VCR, no internet and no more Star Wars. At the climax of The Return of the Jedi, we had all the answers we were ever going to get and a generation took what the movies had briefly touched upon and used the greatest tool available to them - their imagination.
In this list, films that posed some of the most wonderful, ambiguous mysteries have been stripped bare, the imagination made redundant as sequels, prequels and spin offs have provided explanations to the very riddles that lay at the very heart of the film's enjoyment - the question itself.
Was Deckard a replicant? Where did the Space Jockey originate from? Why was the Highlander immortal? Scary questions only provide scary answers.