Students asked the professor to exclude a part of the course from the final exam.The professor agreed.Encouraged by the easy success,the students asked to skip another pare of the course,and then again.However,in the end of the term he did include all the materail in the exam.The class loudly complained:
"Professor,you promised us to skip this stuff!"
The professor answered,"Yes,I did.But I am lied!"
翻译：学生们请求教授在期末考试中排出一部分教程。教授同意了。学生们受到轻而易举就成功的鼓励，又请求再次掠过一部分教学内容，教授又同意了。如此几次。
然而学期末，在考试中所有的内容都囊括其中。学生们大声埋怨到：“教授，你答应我们不考这些的！”
教授答曰“是，是答应了！但是我说谎啦！”