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Unexpected Famous People who actually come across really well
I was watching an old episode of Have I Got News For You earlier on and James Blunt was on it. He was shy, likeable and pretty funny, and actually made an effort to play the game and think of humorous stuff to say, unlike some celebrity guests I've seen on there.
Any other examples, from any field, of famous folk you expected to be total twunts but actually gave a really good account of themselves?