Dan handed me a note that read: “Avoid getting into the business of manufacturing trombone oil. You may become the greatest trombone-oil manufacturer in the world, but in the end, the world only consumes a few quarts of trombone oil a year!” He was telling me not to invest in projects that would sap the resources of my company and me and not give much back. It was such a positive way to impart that wisdom, though, and I still have that piece of paper in my desk, occasionally pulling it out when I talk to Disney executives about what projects to pursue and where to put their energy.