10 Horror Movie Trailers That Gave Away The Entire Plot

10. What Lies Beneath

In Robert Zemeckis' supernatural thriller, What Lies Beneath, Norman and Claire Spencer are a happily married couple until their life is turned upside down after a ghostly encounter.

For the first half of the movie, Claire suspects her neighbour murdered his wife and her spirit seeks justice. However, this turns out to be a red herring. In reality, the ghost belongs to college student called Madison who had an affair with Norman. When Madison was about to make the affair public, Norman murdered her. Now that Claire knows the truth, Norman is forced to kill her too.

Because the film spends so much time setting up the neighbour as the killer, the big reveal is made far more shocking. At least, it would have been if you didn't see the trailer.

The teaser makes it so abundantly clear that Norman is the murderer, it doesn't even feel like it's meant to be a plot twist. In fact, most of the promos don't even mention the neighbours! Although the film has a lot of great jump scares and clever misdirection, the experience was completely ruined for anyone who saw the preview.