Albert Einstein and his driver

Albert Einstein's driver used to drive him to his lecture sessions and also attend them. After attending several lecture sessions he told Einstein that there was nothing difficult about the lectures Einsten used to give and that he could repeat them word for word. Einstein offered the driver to take on the next lecture and that he would become his driver.In the next lecture Einstein's driver did a fine job of delivering the lecture. When a person stood up and asked a question he promptly said "Oh, thats a simple one even my driver will be able to answer it".