I also heard that when Forrest Whittaker spoke with the British accent in whatevermovie that was, that the Americans thought he did the accent well, but the Brits thought it mangled. But at least he was still recognizable - makes me think Hugh Laurie is the better actor.
I also heard the guy who does the Harry Potter audio books playing Not my job on Wait Wait Don't Tell Me - now there's a guy who can do voices!