Black Christmas

Billy Lenz is born in 1970, with severe jaundice due to a liver disease, and is constantly abused by his mother, Constance. Five years later, Constance and her lover murder Billy's father Frank on Christmas Eve and bury the body in the house's crawlspace. Billy witnesses their scheme so they lock him in the attic. In 1982, Constance rapes Billy to conceive another child, since her boyfriend is impotent, and gives birth to their daughter, Agnes. On Christmas Day 1991, Billy escapes from the attic and disfigures eight-year-old Agnes by gouging out her eye. He then brutally murders his mother and her lover. He is caught by police eating cookies made out of his mother's flesh and is sent to a mental asylum, while Agnes is taken to a local orphanage.