Let me interject here with the "Ten foot bug" theory that Steven King uses. He suggests that the really interesting part of a story is the part that isn't spelled out for you, so that you can fill it in with your imagination. The imagination of the viewer is always more disturbing/satisfying than that of the director, since imagination is everyman's vision... while the director's vision is oneman's vision. If you know there is a giant bug behind a door, you are scared to open it because it could be a ten foot bug, but once you open it and see the ten foot bug, you are relieved because it could've been a hundred foot bug... and so on and so on... while if the door is never open, the bug is always as terrible as you can possible imagine it.
All apologies to Mr. King for attempting to paraphrase him.