"Now I can see one or two of you are thinking, now look here, what if one of our American friends makes a boo-boo, presses the wrong button, and sends up one of their missiles by mistake? It could not happen. You see, before they press that button they've got to get on the telephone to number 10 Downing Street, and say, "Now look, Mr. Macmillan, Sir, can I press this button?" And Mr. Macmillan will say "yes" — or "no" — as the mood takes him."