I regularly go to the gym. This time when the instructor came and corrected my stance, it occurred to me that that I must appreciate them for doing their job well and sincerely. So I went and got boxes of chocolates for each of them. I went back and gave it to them, telling them that they were doing a splendid job. All of them were so happy with my small token of appreciation.
Appreciating someone for doing their job well brings happiness to everyone.