This is someone's idea of a joke.

这是某些人的恶作剧。

You could have killed us both. Is that your idea of a joke?

你差点害死我们俩 你是要开这种玩笑吗?

If this is your idea of a joke, I don’t find it at all funny.

【funny】你觉得这是个玩笑，我却一点也不感到好笑。

Look, if this is your idea of a joke, I don’t find it at all funny.

【joke】喂，虽然你认为这很好笑，我却一点都不觉得。

Mr. Mason stayed just long enough to tell the Dursleys that his wife was mortally afraid of birds of all shapes and sizes, and to ask whether this was their idea of a joke.

梅森先生多站了片刻，告诉德思礼家人，他太太对各种各样、大大小小的鸟都怕得要命，并问这是不是他们故意安排的玩笑。