Which famous movie tagline helped turn a $6 million film into a $272 million blockbuster by warning audiences not to reveal the ending?

Marketing taglines have defined some of cinema's greatest moments and helped turn films into cultural phenomena. A great tagline can become just as iconic as the movie itself, capturing the essence of a film in just a few words. This trivia question tests your knowledge of one of the most successful marketing campaigns in film history, which helped transform a modest-budget thriller into a box office sensation and cultural landmark.

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"In space no one can hear you scream." (Alien, 1979)
"The first casualty of war is innocence." (Platoon, 1986)
"Just when you thought it was safe to go back in the water..." (Jaws 2, 1978)
"It's only a movie, but it's one you'll never forget." (The Sixth Sense, 1999)