I am always impress when the bar tenders are kind and learn the name of my elementary school age son, who abuses his soda card on the ships. I know it is such a hassle for the bar tender to deal with children. However the lido deck bar tenders and my son are all best friends by the end of the cruise.
Our last cruise, my son would wave over the gentleman carry shots in the MDR. Ask for a shot for his mom. As soon as I would drink it, he would ask to increase the spending limit on his card. The last night in the MDR, the gentleman talked about how much fun he had listened to my son. Little interactions like that I really cherish.