Perfect Teamwork - Everybody, Somebody, Nobody and Anybody

Once upon a time, there were four people:
Everybody, Somebody, Nobody and Anybody.

Wherever there was an important job to be done,
Everybody was sure that Somebody would do it.
Anybody could have done 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.
Consequently, Everybody blamed Somebody when
Nobody did what Anybody could have done in the
first place.