Point Man, Steve Farrar, pp. 11-12
Albert Einstein was invited to speak at a banquet held in his honor at Swarthmore College. Hundreds of people from all over the country crowded an auditorium to hear what he had to say. When it came time for him to speak, the greatest physicist walked to the lectern, solemnly looked around, and said, "Ladies and gentlemen, I am very sorry, but I have nothing to say." Then he sat down. The audience was in shock. A few seconds later, Einstein got up, walked back to the podium, and spoke again. "In case I have something to say, I will come back and say it." Six months later he wired the president of the college with the message: "Now I have something to say." Another dinner was held, and Einstein made his speech.