What on earth were you thinking? 

On earth 到底；究竟 （惊讶时用）

What’s wrong with you? （你在搞什么？）

What’s your problem? （你是怎么啊？）

Dialogue 对话：

W: Honey, what is this? 这是什么亲爱的？

M: err.. I don’t know what you’re talking about! 我不知道你在说什么？

W: This! Credit card bill? It has like something for 9000! What did you buy? 信用卡账单啊？有一个东西9000块？你买了什么？

M: I bought a new camera! 我买了一个新相机！

W: What? You’ve already got two cameras and you hardly use them? What on  earth were you thinking? 啥米！你已经有两个你几乎不用的相机了，你到底在想什么？

M: It was on sale! 在打折咩！

W: Come on! 你找死！

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