上集的title“Let them eat cake”出自法国路易十六的王后玛丽，本集豪斯医生的tile“Joy to the world” 是一首著名的赞美诗，汉语被翻译成普世欢腾。本集讲述的是圣诞的故事，从介绍来看，大家应该都得到了happy ending，所以用这首赞美诗作为题目还真是贴切。上面的视频是玛丽亚凯莉演唱的版本。

这首赞美诗歌词如下：

Joy to the world! the Lord is come;
Let earth receive her King;
Let every heart prepare him room,
And heaven and nature sing,
And heaven and nature sing,
And heaven, and heaven, and nature sing.

Joy to the world! the Saviour reigns;
Let men their songs employ;
While fields and floods, rocks, hills, and plains
Repeat the sounding joy,
Repeat the sounding joy,
Repeat, repeat the sounding joy.

No more let sins and sorrows grow,
Nor thorns infest the ground;
He comes to make His blessings flow
Far as the curse is found,
Far as the curse is found,
Far as, far as, the curse is found.

He rules the world with truth and grace,
And makes the nations prove
The glories of His righteousness,
And wonders of His love,
And wonders of His love,
And wonders, wonders, of His love.

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