It's Father's Day in the United States. What is a memory of your father that left the greatest impact on your life?

I worked with my dad for 20 years. He taught me almost everything I know about building houses. But I think the two biggest things were, how to deal with tricky clients (this applies to all people, not just clients), and how to come at everything with a relaxed style. He used to say he spent a lot of money in the '60s developing his attitude.