Which horror film's tagline revolutionized movie marketing by creating a false 'based on true events' narrative that drove enormous box office success?

Film taglines can become as iconic as the movies themselves, sometimes driving massive box office success through just a few carefully chosen words. The right tagline doesn't just promote a film - it can become part of popular culture and help establish a film's brand identity in viewers' minds. This trivia challenges you to identify which famous tagline sparked a revolutionary marketing approach that fundamentally changed how horror movies are promoted.

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The Texas Chain Saw Massacre (1974): "Who will survive and what will be left of them?"
The Blair Witch Project (1999): "In October of 1994 three student filmmakers disappeared in the woods near Burkittsville, Maryland, while shooting a documentary..."
The Exorcist (1973): "Something almost beyond comprehension is happening to a girl on this street, in this house... and a man has been sent for as a last resort."
A Nightmare on Elm Street (1984): "If Nancy doesn't wake up screaming, she won't wake up at all."