This is a famous story about four people named Everybody, Somebody, Anybody, and Nobody. If you haven't read this before please read through very interesting one...
There was an important job to be done and Everybody was sure that Somebody would do it.
Anybody could have done it, but Nobody did it. Somebody got angry because it was Everybody's job. Everybody thought Anybody could do it, but Nobody realized that Somebody wouldn't do it.
It ended up that Everybody blamed Somebody when Nobody did what Anybody could have done.