A dog owner claimed that his pet, when given money, would go to the news stall to buy a paper. His friend insisted on a demonstration¹ and handed the dog some money - The dog trotted²（小跑） off, but an hour later he had still not returned with the paper.

"How much did you give him?" asked the owner.

"Five dollars."

"Well, that explains it. When you give him five dollars, he goes to a movie."

一位养狗人宣称：要是给了爱犬钱，它便会到报亭买份报纸来。他的朋友坚持要来做个演示，并给了狗一些钱。狗一溜小跑着去了。但一个小时过去了，仍不见它带报纸回来。

“你给了它多少钱？”狗的主人问。

“五元。”

“这就是了。你给它五元钱时，它就去看电影。”