After leaving the puppet company, Wu met up with a traveling salesman of roundworm medicine. He was apprenticed to him for three months, learning the peddler's "rhetorical tricks of the trade," before going out on his own.
離開戲班後，吳樂天碰到了一位叫賣驅蛔蟲藥的商人，對他的推銷技巧大感興趣，就以一個月三百元的學費，跟他學習走江湖賣藥的說話技巧。