《笑林广记·术业部》
友人急忙捏其大腿说： 呆子快别做声，你看牌子，醋比酒还贵哩！ 
友人忙捏其腿曰： 呆子快莫做声，你看牌面上写着醋比酒更贵着哩！ 
The friend quickly pinched his thigh and said: “You fool, say no more! Look at the signboard, vinegar is more expensive than wine!”