Given the question: Build a movie plot around this: Who is involved in the shootout upstairs? Her father, Ben, and Barbara.
The answer is:
Bickering siblings Johnny and Barbra are traveling by car to a rural cemetery, where they visit their father's grave. Johnny teases his sister's fear of the cemetery after dark, saying "They're coming to get you, Barbra!" They are approached by a pale-faced man who stumbles toward them and attacks Barbra. Johnny pulls the man off of Barbra and struggles with him, but is knocked unconscious and possibly dead after tripping and hitting his head violently on the edge of a gravestone. The man then pursues Barbra back to the car, but Barbra cannot start it because the keys are in Johnny's pocket. She takes the car out of gear and it begins to drift away on its own, but she accidentally steers it into a tree. She abandons the car and runs down a roadway to a nearby farmhouse, with the man still pursuing her. She discovers the house seemingly deserted, and the phone is out of order. Her attacker stumbles around the outside of the house looking for her, and is joined by several others. They all seem to be in a kind of trance, behaving in an animalistic way. Exploring the house further, Barbra makes a gruesome find at the top of the stairs: a human body that seems to have been partially devoured by something.In a panic and attempting to flee the house, Barbra is intercepted by Ben, who arrives in a pickup truck and attacks the mysterious figures with a tire iron. Barbra is further driven into hysteria when she sees Ben violently smashing the skulls of the strange men who keep trying to get into the house. Ben urges her into action and the two of them begin boarding up the doors and windows from the inside with dismantled furniture and scraps of wood. They awkwardly trade their stories; Ben seems to be a drifter who was passing through the area when suddenly a wave of unexplained violence began unfolding. He tells Barbra about a scene of mayhem that he encountered at a diner, and Barbra tells him about the incident with Johnny in the cemetery. When Barbra becomes hysterical and wants to go out after Johnny, she strikes...