Amityville II: The Possession
More of a prequel than a sequel to 1979's "The Amityville Horror." This film features mass slaughter, incest and an 'Exorcist' inspired plot. The demonic forces drive a father to beat his kids and a mother to prayer. They also drive Jack Magner, a possessed teen, who beds his younger sister after hearing the voice of the devil on his Sony Walkman. He develops ugly boils on his face and kills his entire family with a shotgun.