"Adam (re Duel)
That's kind of an arbitrary distinction. Duel is more appropriate for this list than Killer of Sheep which, like Duel, was not intended initially as a cinema release but was a student film. At least Duel was released, with additions, in cinemas in the 1970's and successfully; something which didn't happen with Killer of Sheep until this decade. Duel belongs in the top 50."