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.

“Everything you want should be yours: the type of work you want; the relationships you need; the social, mental, and aesthetic stimulation that will make you happy and fulfilled; the money you require for the lifestyle that is appropriate to you; and any requirement that you may (or may not) have for achievement or service to others. If you don’t aim for it all, you’ll never get it all. To aim for it requires that you know what you want” ~ Richard Koch