Q: What's the difference between a monkey and a flea?
A: A monkey can have fleas, but a flea can't have monkeys.
猴子会和跳蚤有什么不同呢？你可能会直接的想到它们俩是一大一小。但除此之外呢，那就是猴子身上可以长跳蚤，而跳蚤身上却不能有猴子。这个答案很有意思吧？
Dentist: I'm sorry, madam, but I'll have to charge you twenty-five dollars for pulling your son's tooth.
Mother: Twenty-five dollars! But I thought you only charged five dollars for an extraction.
Dentist: I usually do. But your son yelled so loud, he scared four other patients out of the office.
昂贵的代价
牙科医生：对不起，夫人，为给您的儿子拔牙，我得收二十五美元。
母亲：二十五美元！可是我知道您拔一颗牙只要五美元呀？
牙科医生：是的。但是您儿子这么大声地叫唤，他都吓跑四位病人了。