《资治通鉴·唐纪·唐纪六十七》
丁巳，来到泗州。泗州刺史杜在球场为戍卒们设宴，有唱戏的优人致辞，徐泗戍卒以为是取笑自己，抓住优人就要问斩，在坐的宾客吓得四散而逃。
丁巳，至泗州，刺史杜慆飨之于球场，优人致辞。徐卒以为玩己，擒优人，欲斩之，坐者惊散。
Ding Si, came to Sizhou. The prefect of Sizhou, Du Zai, held a banquet for the garrison soldiers at the football field. There were singers and performers who gave speeches. The Xu Si garrison soldiers thought they were making fun of themselves, so they arrested the performers and demanded that they be executed. The guests at the banquet were so frightened that they fled.