The Texas Chain Saw Massacre (1974)

Shot in 100-degree Texas heat with unknown actors and a real animal carcass prop, its documentary aesthetic outguns Alien (1979)'s polished sci-fi by delivering raw, unfiltered dread. Leatherface's chain-saw roar and Sawyer family's cannibalistic madness pioneered the 'inspired by true events' genre, yet only 1.2 seconds of screen blood was used — a concrete data point proving restraint amplifies horror. This film remains foundational 50 years later.