Fans of the slasher genre can look back to the 1979 horror movie When A Stranger Calls for starting a lot of trends and tropes. The story of a babysitter named Jill Johnson (Carole Kane) taking care of kids while being stalked by a killer was truly the first of its kind. While many horror movies have been inspired by this amazing and impressive film, it's really the gold standard for how to tell this type of story.