馬克‧吐溫曾說過一句有名的話：「一場好的即席演說通常需要三個星期以上的時間來準備」

出處: Morr, T. E., photographer. "Mark Twain, Full-Length Portrait, Facing Left, Seated on Step, Outdoors, Holding Cigar." 1903. Prints and Photographs Division, Library of Congress.