Angel Heart (1987)

Now this is an old-fashioned horror movie. It starts with an intriguing premise - a 1950s era private investigator (Mickey Rourke) hired by a thinly-disguised avatar of the devil (Robert De Niro in a creepy portrayal, if somewhat more by-the-numbers compared to Al Pacino in The Devil's Advocate) to track down a crooner who sold his soul for success, and then wound up a vegetable following his service in the war, precluding the devil from collecting on his contract. But what really sells the film is the atmosphere it exudes, right from the steaming New York City alleyways in the opening shot, to the voodoo-laced streets of New Orleans where the detective eventually ends up. Kudos also to this movie for not holding back, and crossing a particular line few ever dare to cross (even in horror movies that are supposed to be "messed up"). But as with most mysteries, the less I say about the plot, the better. "How terrible is wisdom when it brings no profit to the wise?" Suffice to say that it's an excellent movie worth taking a couple hours out of your schedule sometime to sit down and watch.