Everybody, Somebody, Nobody

Four people named. everybody, somebody, nobody and anybody. 
It was an important job to be and everybody was asked to do it.
Everybody was sure that somebody would do it. 
Anybody could had done it but nobody did it.
Somebody got angry about it 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.