There's loads of movies that bomb at the box office or just don't cause that much of a fuss, upon release but go in to become major cult hits. For example: The Big Lebowski, Donnie Darko, Fight Club etc.
But what are some movies that you thought would get to that cult status but just instead kinda faded away into obscurity? Or maybe a film that you just feel is good enough to be far more popular that what it ended up becoming...