I saw an elderly man and his wife eating lunch. He was wearing a Korean War Veteran cap. I secretly gave the waitress a card I had made up that says: My heartfelt thanks to you, Veteran. In a world where there seems to be fewer heroes, please know that you will always be one in my eyes. From a Fellow American. I also gave her money to pay for their meal.
I overheard them say, "This made our day!" and that was all I needed to make make MY day!
I had three employees comment to me that they thought that was so nice. I hope I made enough impression so maybe they would do something similar one day.