ClassandAssClass and Ass班和笨驴Professor Laurie of Glasgow put his notice on his door: Professor Laurie will not meet his classes today.格拉斯哥的劳里教授在门上贴了这样一个通知：“劳里教授今天的课程取消。A student,after reading the notice, rubbed out the c.一个学生读了通知后，擦掉了字母C（lass：姑娘）。Later Professor Laurie came along, and entering into the spirit of the joke,rubbed out the l后来劳里教授来了，也想开开玩笑，他擦掉了字母“I ”( ass:笨驴)。
