What does Chinaski cite as the tragedy of his father's life in the book, You Get So Alone at Times That It Just Makes Sense?

In "Retired" Chinaski lays out the tragedy of his father's life. His father works every day of his adulthood and speaks relentlessly about the glorious retirement that waits him. Chinaski's father never sees that retirement, though. He dies suddenly one day, and all his friends say he looks young in his coffin. He never missed a day of work.