Mulholland Drive

It started as a rejected TV pilot, and Lynch shot new material to close it off as a film, which partly explains its broken-backed shape. For two hours it plays like a dream of Hollywood: a hopeful actress arrives, finds a dark-haired woman with no memory hiding in her aunt's apartment, and the two start chasing the woman's identity through an LA that keeps going strange. Then roughly an hour from the end the whole thing buckles, names and faces swap, and the warm story curdles into a much bleaker one. People still argue about what literally happens, and that is part of why it keeps drawing them back.