The Everybody Somebody Anybody Nobody Story

This is a story about four people: Everybody, Somebody, Anybody and Nobody.
There was an important job to be done and Everybody was asked to do it.
Everybody was sure that Somebody would do it.
Anybody could have done it, but Nobody did.
Somebody got angry (about that) because it was Everybody's job.
Everybody knew that Anybody could do it, but Nobody realised that Somebody wouldn't do it.
And It ended up that Everybody blamed Somebody because when Nobody did what Anybody could have done.

Simplified version of Charles Osgood's "Poem about responsability"