Who do you think you are? 你以为你是谁？

What were you thinking? 你脑子进水啊？

Can’t you do anything right? 成事不足，败事有余。

Who says? 谁说的？

Are you insane/crazy/out of your mind? 你疯了吗?(美国人绝对常用!)

What’s the meaning of this? 这是什么意思?

Do you know what time it is? 你知道现在都几点吗?