Gerald, asked the teacher, what is the shape of the earth?
It's round, answered Gerald.
How do you know it's round? continued the teacher.
All right, it's square then, he replied, I really don't feel like getting into an argument about it!

杰拉尔德，老师问：地球是什么形状？
是圆形的，杰拉尔德回答道。
你怎么知道是圆的？老师又问。
好吧，那它是方的，学生回答说：我可不想与你争论这件事情。