Listening to the Empire Strikes Back soundtrack I suddenly realized that because the voice acting was added later, Mark Hammill pulled off his character having an entire worldview shattered after listening to David Prowse's accent. This, right before dramatically falling 10' backwards into a batch of old old mattresses.
Really, I should have always given that guy more credit as an actor.
@Leucrotta his voiceover work is stunning.
@kelseyhusky I forget which game he did it for, but I ran into a YouTube clip of him as *Wolverine*, and it worked.
Update;
apparently Prowse was given "No. Obi-Wan killed your father" as the script, so it was a surprise for him, too. So... a reaction to what he knew the line actually was, rather than reacting to someone saying it in a very very English accent.