Winston Churchill to George Bernard Shaw
George Bernard Shaw was a legendary Irish playwright who was on good terms with the British politician Winston Churchill.
One time, the two were exchanging letters and Shaw offered Churchill to come and see his play 'Buoyant Billions':
Shaw: Have reserved two tickets for opening night. Come and bring a friend, if you have one.
Churchill: Impossible to come to first night. Will come to second night, if you have one.
Well you see, they were looking for witty retorts.