Jake Weary and Maika Monroe in It FollowsIT FOLLOWS

Any horror fan who came of age with Halloween, Friday the 13th, and their many sequels knows the ironclad rule regarding imperiled teens: If they have sex, they're gonna die. So maybe you'll have to be of a certain generation - or have an affinity for a certain breed of shocker - to get the most from It Follows, writer/director David Robert Mitchell's intensely witty, pretty damned scary tale of a young woman diagnosed with a literally murderous, and ambulatory, STD.