Haircut during the Serman

A Rabbi, known for his lengthy sermons, noticed a man get up and leave during the middle of his message. The man returned just before the conclusion of the service. Afterward the Rabbi asked the man where he had gone." I went to get a haircut," was the reply. "But," said the Rabbi, "why didn't you do that before the service started?" "Because," the gentleman said, "I didn't need one then."