My luck was my father not striking oil... we'd have been rich. I'd never have set out for Hollywood with my camera, and I'd have had a lot less interesting life.
There is the story in every man's heart of human progress. I believe every one of us knows that his major job on Earth is to make some contributions, no matter how small, to this inexorable movement of human progress.
When I was very young, I tried selling used cars. It didn't last long. I guess that was my good luck too, that I didn't show more promise at it, or I might have been an automobile dealer.