Class and Ass

Professor Laurie of Glasgow put this notice on his door: "Professor Laurie will not meet his classes today."

A student, after reading the notice, rubbed out the "c".

Later Professor Laurie came along, and entering into the spirit of the joke, rubbed out the "l".

“班”和“笨驴”

格拉斯哥的劳里教授在门上贴了这样一个通知：“劳里教授今天不会他的班。”

一个学生读了通知后，擦掉了字母“C”。

后来劳里教授来了，也想开开玩笑，他擦掉了字母“L”。