Not my job

This is about four people named Somebody, Anybody, Everybody and Nobody
There was an important job to be done.
Everybody was sure that Somebody would do it.
Anybody could have done it.
Somebody got angry, because it was Everybody's job.
Everybody thought Anybody could do it.
But Nobody realised that Everybody wouldn't do it.
It ended up that Everybody blamed Somebody,
when Nobody did what Anybody could have done.