@Emperor - you really think a movie from 30 years ago is a good example of what we can do today? Back then, all they could do was splice in entire scenes with the actor in it. Today, you can take a number of frames of the actor from different angles and create a mesh of the actor's face. With that mesh, you can make him do anything or say anything you want, in living color, in a pink tutu while standing on a tightrope across skyscrapers in New York.
"I'm the digital ghost of Abraham Lincoln, and I approve this message."