The ability of horror films to subject their audiences to misery, terror, and shock vicariously as a form of entertainment is truly something unique, and has proved to be incredibly profitable. But there have been certain horror films that pushed the boundaries just a bit too much and the audience became offended rather than entertained. Some horror films courted massive amounts of controversy by pushing creative and censorship boundaries of their time; others pushed the shock factor up to eleven by truly disturbing their audiences with heavy gore and/or psychological warfare. And then there are those polarising and attention-grabbing horror films that were made purely to evoke a response from whoever is paying attention, no matter how terribly made they are. In short, there is a rich history of controversial horror films that pushed socially acceptable boundaries upon their release and garnered considerable notoriety for their content and (occasionally questionable) artist merit. But which were the most notoriously shocking?