It was revealed on this episode by David Walliams that Jimmy Carr sits on a cushion on top of his chair while filming 8 out of 10 cats, he sits on it for two reasons, so he is at the right height for the camera and so he is a little higher up than the contestants.
Jimmy Carr: A lot of people cry when they chop onions, I don't, the trick is not to form an emotional bond.
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