“扬州八怪”之一的郑板桥,是清代著名的书画家,曾任山东潍县县令。一次,有位教书先生来县衙告状,诉说在财主家教了一年私塾,原定八吊钱的酬金,主人赖账不给。郑板桥心想:莫非这位先生文才不好,误人子弟,主人才不付酬金?于是灵机一动,想考考这位教书先生。他出了一上联: 四面灯,单层纸,辉辉煌煌,照遍东西南北。教书先生略加思索,朗朗对道: Zheng Banqiao, one of the “Eight Eccentrics in Yangzhou”, was a famous painter and painter in the Qing Dynasty and once served as county magistrate in Weifang, Shandong. Once, there was a teacher who came to the county Yazhou state, told the rich tutor a year private school, originally scheduled for eight money remuneration, the owner does not give. Zheng Banqiao thought: Could this gentleman is not good, misleading children, the masters do not pay the emperor? So inspirational, want to test the teacher. He made a couplet: four lights, a single layer of paper, glory, according to all over the East and West. Teaching gentleman slightly pondered, Lang Lang on the Road: