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?