Friend of the Gutter Sara Century looks at Nunsploitation.  “Evil nuns exist in movies at least as far back as the silent film Haxan: Witchcraft Through the Ages. Now considered a masterpiece of the silent era, the film initially polarized audiences, in no small part due to scenes like the one where a nun becomes enthralled by Satan and causes hysteria to break out at her convent. Nuns that meet with Satan for about five seconds and completely lose control of themselves would go on to pretty much become its own genre, but it took a few years.”