This is a good story.

Back when it first came out, "Steve" was at a party and heard some people talking about the movie. He hadn't seen it, and politely listened. He heard the entire plot, including all the twists and a dozen spoilers. Later that week he was with another group and they decided they wanted to see the movie. Steve didn't want to spoil everyone's fun, so he went, even though he thought he'd be bored.

Later, he wrote about how, even knowing the plot and the surprises, he was still on the edge of his seat for the whole movie.

There's a reason people are still talking about this decades old movie.