When Feynman was nearing death, he asked Danny Hillis why he was so sad. Hillis replied that he thought Feynman was going to die soon. Feynman said that this sometimes bothered him, too, adding, when you get to be as old as he was, and have told so many stories to so many people, even when he was dead he would not be completely gone.
Source: Richard Feynman – Wikipedia