Bertrand Russell, somewhere, recalls a music-hall song about the ingenuity of flies in being able to walk upside down on the ceiling. It asks "Can Lloyd George do it? Can Ramsey Mac do it?" etc., and answers "Why, no!" Neither Google nor the DigiTrad recovers it, tho the former does bring up a pamphlet by Keynes & Henderson in 1929 with the title "Can Lloyd George Do It?", which I suspect alludes to the song. If I knew the words & music, I would be glad to take on the task of fitting it to more recent personages.