Vertigo

The last movie in the Hitchcock unit was the 1958 film Vertigo.  From the very beginning of the film we see how James Stewart's character John, or Scottie, developed his fear of heights.  His acrophobia (as well as the title) seemed irrelevant until the scene where "Madeleine" is running up the stairs of the bell tower determined to throw herself off committing suicide.  He runs up after her, but his vertigo stops him dead and is forced to watch her jump.  If it wasnt for this, he would have saw that it was entirely fake and the real Madeleine was already dead but made to appear as a suicide.  The Madeleine he knew was another woman playing a role in a twisted plot to cover up a murder.  Hitchcock manages to successfully accomplish keeping the suspense in all of his films to make them all memorable.