Sandra Cassel,Jeramie Rain,Lucy Grantham in The Last House On The Left (1972)

Writer/director Wes Craven and producer Sean Cunningham's chilling take on, of all things, Bergman's "The Virgin Spring" still packs more shocks than most of its successors. After a gang of drug-dealing sadists murders two teenage girls, they take refuge in a suburban family's home, unaware it's the home of one of their victims. When the parents discover the truth, they exact a gruesome revenge. "To avoid fainting, keep repeating: It's only a movie...It's only a movie." David Hess, Fred Lincoln, Sandra Cassel star. 84 min