https://bbs.wenxuecity.com/mysj/261492.html 提到：
An in-joke, also known as an inside joke or in joke, is a joke whose humor is clear only to people who are in a particular social group, occupation, or other community of common understanding; an esoteric joke. It is humorous only to those who know the situation behind it. （Source: Wikipedia）
In-joke，也叫inside joke或in joke，是只有在同一个社交圈子、职业或者思维理解方式一致的群体内才明白的幽默，即“圈内人的幽默”。只有那些了解事件背景的人才能明白其中的幽默之处。
俺的例子是-
What is Chemistry?
Chem is try!
笑友们，你们专业的内部笑话何在？
祝大家新年快乐
