前面推文已经回答了，不过想到电视剧一段有趣的对话，有提到这件事。
不想被剧透
Brooklyn Nine-Nine (荒唐分局) 的就别往下看了。
第二季有一集，两位警探 Peralta、Boyle 跟邮政检查局的 Jack Danger 一起查案。
看到路边有一个小贩，可能在摆摊时看过可疑的人事物，所以想要过去问清楚。
Danger 说让他去问比较好：
Uh, you should probably let me take lead on this.
A lot of people don't like cops, but everybody loves postal workers.
Peralta: They do?
Danger: That's why the phrase most associated with bringing goodness into
people's lives is "going postal."
Boyle: You're kidding, right? "Going postal" means that...
Danger: I know what it means! I just said what it means.
That's what it means.