剧情梗概：有话直说的谢耳朵说话从不经过大脑。Leonard正在为Penny嫁给他人而生气， 谢耳朵又不恰当地接了下茬。

对话文字：

Sheldon: Like we are on a ship, coming from Africa to America.

Amy: Sheldon, that’s completely inappropriate. You can’t keep comparing yourself to a slave.

Sheldon: Yes, Miss Amy.

Leonard: I can’t believe you’re married to that idiot.

Penny: Ugh, would you stop? We just did it as a goof.

Leonard: Well, a goof or not, you’re actually married. You need to get this taken care of.

Penny: I will. Why are you making this such a big deal?

Sheldon: Oh, oh, oh, I have a reason. It could be because you said yes to marrying Zack, but every time Leonard’s proposed, he’s gotten resounding no. Yeah, that’s just *off the top of my head.

对话精讲：

*off the top of your head 意思就是一件事没有经过认真思考或核实、仅仅靠推测或是记忆就说了出来。可以用来表达“一时想起、大概估计”的意思。例如：
I can't remember the name off the top of my head, but I can look it up for you. （那个名字我一时想不起来，但是可以帮你查查。）