Whose Job is it ? ? ?

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