Who shall do it?

This is a story about four people. Their names were Anybody,
Everybody, Somebody and Nobody.

Once there was an important job to be done and Everybody was
asked to do it. Everybody was convinced Somebody would do it.
Anybody could have done it, but then Nobody did it. Somebody
was angry, because it was Everybody’s job. But Everybody
thought Anybody could do it and Nobody realized that not Everybody
would do it.

Finally Everybody accused Somebody because Nobody had taken care
of what Anybody could have done.