This is a lesson I remember when I go to a restaurant or even one of those hamburg-flipping places. Yeah, they are getting paid to serve me, but I appreciate their smiles and courteous service anyways.
As someone who's first job was at a hamburger-flipping joint, I get upset everytime someone makes a joke about those kind of jobs as if they were somehow demeaning. I got paid $1.35 an hour, and flipping hamburgers helped me to pay for books when I went to college. There is honor in all honest work.
That is absolutely one of the best lessons of all!