When Rob Zombie’s House of 1000 Corpses slashed its way into theaters 20 years ago, 1970s-style horror — and camp — returned with bone-snapping, scream-inducing vengeance. Zombie’s directorial debut, this first film of a trilogy introduces the Firefly family, backwoods sadists who plunge two young couples into a nightmare world of torture, satanic ritual, and cannibalism. With a killer cast including horror legends Sheri Moon Zombie, Bill Moseley, Sid Haig, and Karen Black, House of 1000 Corpses is both a homage to a golden era and a scary good time from an innovative, unrivaled shock-master.