Yes, we're all very excited about "Star Wars: The Force Awakens," but let's take a minute to go a little bit further back to the galaxy slight farther away, when George Lucas was just a kid with a dream called "Star Wars." Back then, while shooting the movie, he had the actor who physically inhabited the body of Darth Vader, a British actor named David Prowse whose stature and prowess as a bodybuilder earned him intimidating roles in Stanley Kubrick's "A Clockwork Orange" and a pair of Hammer horror movies (where he essayed the role of Frankenstein's hellish creation). But, as the behind-the-scenes footage unearthed from some forgotten documentary by Gizmodo shows, his intimidation was limited to his physicality, because his voice is pretty wimpy.
In the behind the scenes footage (which you can watch below), Prowse sounds very much like a nasally British guy trying to be threatening. Instead of the booming intonations of James Earl Jones, whose raw menace gave threatening dimension to the character, you watch the scenes with a reedy pipsqueak behind the mask. It's altogether unpleasant and also kind of hilarious.
Thankfully calmer heads prevailed and his voice was swapped out. But can you imagine if this guy stuck? Whew boy. The Force is not with this guy.