For example, are you thinking of:
* The Shining (1980): A psychological horror film about a family who becomes isolated in a haunted hotel.
* A Clockwork Orange (1971): A dystopian film that explores violence, free will, and morality. While not strictly a horror film, it contains disturbing and violent elements.
* Eyes Wide Shut (1999): A dark and mysterious film about a man's journey into a hidden world of eroticism and danger.
Tell me more about the film, like its plot or the setting, and I can help you figure out the name.