What was the most personally gratifying job you ever held?

Teaching little ones how to swim. When I was 14-16, I taught 3-12 year olds how to swim. Lifeguarding was pretty awesome, too, but teaching the little ones was probably more gratifying. They were cute and fun, most of them. Some were unbearably annoying, of course. And some of the parents were unbearably annoying too. But, overall, probably the most gratifying job I've ever had. Maybe that will change when I start personal training. Hopefully. Because landscaping is not gratifying.