Defining horror is difficult to do. Defining the horror genre is likewise difficult. Regarding the latter, some viewers prefer gore, slasher films, and camp. Others solidly follow their favorite monster: vampire, zombie, and so on. Thrillers and science fiction films often elide with horror. I tend to think of horror as a psychological effect, and there are many ways to get there. I think horror involves a process of defamiliarization, a way of unsettling one’s mind by warping the senses–the uncanny, I suppose. Although I do enjoy camp, I am a bigger fan of true horror, which is an idea I find difficult to qualify. In the end, it is our examples that best illustrate our positions. This list was composed in no particular order, albeit the top three are in my top three. Freddy and Jason never made it to my list. Many of these films have nothing to do with the supernatural, albeit they all upset out notions of the natural. A few made the list simply because they make my list of favorite directors and I couldn’t imagine leaving them off any list. So, Dear Reader, if you are home and running out of ideas during a horror film marathon, maybe my list will extend your evening. Cheers.