The Perfect Body

I live in a world where there are many bodies. I am not talking about the ones with arms and legs. I am talking about the ones who take responsibilities for their actions. My name is "Somebody". When there is a task to be done, people always assume that Somebody will do it. And they are right. Somebody follows through and the task is completed. Sometimes, Somebody gets tired. The other bodies know that things need to get done. In the perfect world, they would be done by "Everybody" and "Anybody". "Nobody" does anything.  So, in essence, the fact is, Everybody and Anybody can do the job. Somebody does it and Nobody says thanks.