These three levels include gross-out, horror and terror. The gross-out defines a film that physically revolts an audience the ew factor found in movies like The Terrifier . The horror portrays the unbelievable nightmare fuel caused by an aspect so unnatural that viewers can not wrap their heads around it.

Terror is usually described as the feeling of dread and anticipation that precedes the horrifying experience. By contrast, horror is the feeling of revulsion that usually follows a frightening sight, sound, or otherwise experience.