Get him his change? You must be joking.

给他找零钱？你一定是在开玩笑。

You must be joking! We need four televisions!

你一定是在开玩笑！我们需要四台电视机！

You must be joking. Those two?

你一定是在开玩笑。那两个？

Scarlett: Rhett, you must be joking.

斯佳丽：瑞特，你肯定在开玩笑。

Carmen: He's only OK?! You must be joking.

卡门：他只是可以？！你一定是在开玩笑。

Mom, you must be joking. Don't alarm us like that.

妈，你在开玩笑，不要吓我们。

You must be joking. They're barely making ends meet.

你一定是在说笑。他们刚够收支相抵。

Learning English is a plain breeze? You must be joking!

学英语容易?你是开玩笑吧！

You must be joking. How can this kind of thing be true ?

你一定是在开玩笑，怎么有可能是真的呢?。

You must be joking. 2009 will begin with a wail, and then get worse.

2009年一开年即是遍地哀鸿，今后只会更糟糕。