How is suspence created in the film you watched in class?

In class, we watched the supernatural thriller "What Lies Beneath" directed by Robert Zemeckis. The plot of the film is about a couple who experience a strange haunting that slowly uncovers secrets about there pasts. Suspense is created in the film by using false plateau. False plateau is when the audience think something is going to happen but it doesn't happen. A good example of this would be when Claire walks up the stairs and you expect something to happen or someone to be waiting for her, and she walks into the bathroom with the shower running and u would asume that theres someone in the bathroom.