I remember when I was doing a film with Fred Astaire, it was nothing for him to work three or four days on two bars of music. One evening in the dark grey hours of dusk, I was walking across the deserted MGM lot when a small, weary figure with a towel around his neck suddenly appeared out of the giant cube sound stages. It was Fred. He came over to me, threw a heavy arm around my shoulder and said: "Oh Alan, why doesn't someone tell me I cannot dance?" The tormented illogic of his question made any answer insipid, and all I could do was walk with him in silence.