Scream
Although Scream successfully satirized its genre, it still managed to adhere to the "rules" of horror, including both a twist ending and a final girl. During the movie's climax, Billy Loomis (Skeet Ulrich) and Stu Macher (Matthew Lillard) tell Sidney (Neve Campbell) that they are both the killers. Loomis pressured his best friend into helping execute a murderous spree in Woodsboro out of spite for his parents' separation caused by Maureen Prescott.