That's Not My Job (or Who's To Blame?, Whose Responsibility?, or 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 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 Nobody did what Anybody could have done.

or the alternative last line:

And it ended up that Everybody blamed Somebody

because Nobody actually asked Anybody.

The alternative last line is more appropriate for illustrating principles of responsibility and delegation, whereas the one above it is more appropriate for principles of individuals taking personal responsibility, irrespective of delegation.

Read the long version of the poem:

A Poem About Responsibility

There was a most important job that needed to be done,
And no reason not to do it, there was absolutely none.
But in vital matters such as this, the thing you have to ask
Is who exactly will it be who'll carry out the task?

Anybody could have told you that everybody knew
That this was something somebody would surely have to do.
Nobody was unwilling; anybody had the ability.
But nobody believed that it was their responsibility.

It seemed to be a job that anybody could have done,
If anybody thought he was supposed to be the one.
But since everybody recognised that anybody could,
Everybody took for granted that somebody would.

But nobody told anybody that we are aware of,
That he would be in charge of seeing it was taken care of.
And nobody took it on himself to follow through,
And do what everybody thought that somebody would do.

When what everybody needed so did not get done at all,
Everybody was complaining that somebody dropped the ball.
Anybody then could see it was an awful crying shame,
And everybody looked around for somebody to blame.

Somebody should have done the job
And Everybody should have,
But in the end Nobody did
What Anybody could have.

Charles Osgood