The big Black Vader head that presides over the big Star Wars montage. Have I got a better idea? -Nope. So, it's not exactly an original idea, but neither is a round wheel. It just works better than anything else.
As Iain McCaig pointed out, Vader is the best villain design ever. \ It's a black skull wearing a nazi helmet. You can't beat it.
My friend, french artist Stephane Roux says he grew up with a french dubbed version of the trilogy. No James Earl Jones, just some alto-ranged french guy..'Luooke, I yam yoor Fah-thair'.