Once upon a time there were four people. Their names were Everybody, Somebody, Nobody and Anybody.
Whenever there was an important job to do, Everybody was sure that Somebody would do it. Anybody could do it, but Nobody did it. When Nobody did it, Everybody got angry because it was Everybody's job. Everybody thought that Somebody would do it, but Nobody realized that Nobody would do it.
So, consequently, Everybody blamed Somebody when Nobody did what Anybody could have done in the first place!
(If not your children, I'm sure you work with these four.)