"How-how does the universe end?" said Billy. "We blow it up, experimenting with new fuels for our flying saucers. A Tralfamadorian test pilot presses a starter button, and the whole universe disappears." So it goes."If you know this," said Billy, "isn't there some way you can prevent it? Can't you keep the pilot from pressing the button?" "He has always pressed it,and he always will. We always let him and we always will let him. The moment is structured that way."--Slaughterhouse-five