What kinds of stories does Jack tell while he is riding on the tractor by himself before the accident? How do his stories change after the accident?

Before the accident, Jack's stories are filled with heroic battles with evil doers and daring rescues of kidnapped women. He is the hero and rescuer of his stories. After the accident, Jack's stories are dark ones in which he sacrifices himself for a greater good. He confesses all of his pitiful wrongdoings to women he cares about but in the end, he cannot finish the stories due to how pathetic they all sound.