David Prowse was the guy in the Darth Vader suit in Star Wars. He spoke all of Vader's lines, and didn't know his voice was going to be dubbed over by James Earl Jones until he saw the screening of the movie.

The best years of your life are the ones in which you decide your problems are your own. You do not blame them on your mother, the ecology, or the president. You realize that you control your own destiny.” – Albert Ellis