I don't know if this has been asked before, but I figured I'd try anyway. There are a lot of threads asking what are your favorite demo discs. My question digs a little deeper. IF ALL OF YOUR DVD's HAD TO BE TAKEN AWAY (Heaven forbid!) EXCEPT ONE. What is the ONE DVD you would have to keep. It's ok to list reasons: Picture Quality, Sound , Story Line etc. Mine would have to be U-571 (subject to change later in this post) for sound and story line. It may or may not be accurate, but I enjoyed it regardless.