I recently watched a documentary about the art of film editing and how much control you have as an editor over the whole film and how you can change an audience reaction. The documentary was called 'The Cutting Edge The Magic Of Move Editing.' Here is a link to the documentary if anyone is interested. http://www.youtube.com/watch?v=U76MBDKQe8s
I found Steven Spielberg's chat about the editing of jaws very interesting and how a few split seconds can change everything.