What if there was a Death Day instead of the normal death-whenever-god-wants? What will happens to a society that face and live with the Death Day? Could it be a natural process or it was a technological demand? What people could feel? How could it be different from the natural process that we have today?
And if is a Death Day, maybe could be Birth Day; it’s pure logic.
I think this idea could be a very good short history.
Just a though that I had today in the way to the work.