Texas Chainsaw Massacre 4

Jenny and her prom date are getting high in a random car in the parking lot when heather and her beau take the car out for a spin to get away from the party and deal with his infidelity at another location. Once they take a wrong turn, they get into an accident and have to ask for help, then are, of course attacked, maimed, and terrorized by a family of unhinged rednecks.