The name sounds funny but the idea is no joke: a personal toilet called the Peepoo.

VOA: special.2010.03.15

That seems like a bad joke,but if the body theory is right, it's not a joke at all.

又是一个冷笑话，但如果肉体主义者是对的，这就不是开玩笑了。

耶鲁公开课 - 死亡课程节选

Before you go, it is the weekend, I will send you off with a joke.

在离开之前，现在已经是周末了，我会给你们讲个笑话。

麻省理工公开课 - 固态化学导论课程节选

My brother is such a person. It is true C no joke.

VOA: special.2009.07.19

That it is intended as a kind of joke to, in many ways, discredit the idea of the just city or at least to indicate its extreme implausibility.

目的是要用作戏谑，在很多方面，使人怀疑正义之城的概念,或至少是要指明其极难令人置信。

耶鲁公开课 - 政治哲学导论课程节选

And his big finding is that you could separate people-- you could separate the question of laughter from the question of a joke or the question of humor.

他有一个重大的发现,你可以区分…,你可以区分什么是笑,什么是玩笑，什么是幽默。

耶鲁公开课 - 心理学导论课程节选