Everybody's business is nobody's business.
There are 4 people named everybody, somebody, anybody and nobody.There was an important job to be done, and everybody was asked to do it. Everybody was sure that somebody would do it. Anybody could've done it, but nobody did it. Somebody got angry about that because it was everybody's job. Everybody thought anybody could do it, but nobody realized that everybody wouldn't do it. It ended up that everybody blamed somebody when nobody did what anybody could have done.
三个和尚没水喝
有四个人分别叫做“每个人”、“某个人”、“任何人”和“没有人”。一次，每个人都被要求去完成一项重要的工作。大家都相信某个人会去做这件事。任何人都能完成,但是没有人去做。某个人对此很生气, 因为它是每个人的工作。每个人都认为任何人可以完成这件事,但没有人认识到大家都不会去做这件事。最终, 当没有人去做“任何人”都能做到的事情时，每个人都在抱怨某个人。