I think the two endings for "Get Out"
can almost single-handedly determine the genre. The theatrical ending makes it a dark-comedy/suspense hybrid, but the alternate one makes it a straight-up horror (mostly because of how Chris is handled). A real horror movie would usually set up the victim to be a douchebag the audience would want to see bad shit happen to, but Chris is a more or less okay guy twisted by events. The alternate ending is creepy because he's in prison and doesn't care.