The document discusses how twins are often used in horror films to create an unsettling atmosphere. The author, who is a twin, is making a horror film featuring twins as the main characters, a protagonist and antagonist. As a twin, the author was interested in researching the strong psychological bond between twins that some believe allows them to feel each other's pains and emotions, which will be a plot element in the film as the protagonist realizes something is wrong with her brother. The document provides examples of inspirational horror films that feature twins, including The Shining, Dead Ringers, Sisters, and Twins of Evil.