Here's a film that was seriously awesome and terrifying all at once. This was serious S*** for us back in the 80s, and the sequel "Hellbound" was equally intense and gory. I based my version of Darth Plagueis off Pinhead before the novel came out, and I had put elements of Hellraiser into my Star Wars saga whenever Conradin battled Plagueis and his acolytes (I originally called them cenobites). Although there is a lot of blood and gore, the mythology behind Pinhead and the puzzlebox is really interesting. Clive Barker is quite physical with his horror. This is definitely NOT for the squeamish.
Famous scene from Hellraiser that really introduces Pinhead and what he represents.
A scene from Hellraiser II. Just as Pinhead influenced my ideas for Plagueis, this scene was a major influence my design for the Sith homeworld back in 2005 when I wrote "There Were Ten". Again, warning, I find this to be intense stuff. Clive Barker is not for everyone.