When on Galaxy last October, we had a regular night attendant (not cabin stward) who would bring us ice, lime, lemon, and sometimes a late snack. One night we had no singles. When I apologized he said not to worry; he wd rather be taken care of at the end of the cruise.
Also on board ship was a darling little African-Nicaraguan girl who delivered room service meals. We tipped as we went. Her name was Carla. On the last night of the cruise, we called Carla to the cabin and gave her an inexpensive pair of my thongs, which she had admired repeatedly, a little bit more money and a business card. Carla cried, told me how much I resembled her mother and said that she was homesick. It is amazing how little some people have, and how tiny acts of kindness can affect them. We sincerely hope, however, that she does not show up lock, stock and barrel looking for a rich, African American, adoptive mother. :-)She will have missed the mark on two of the three counts.
The point is that a little kindness goes a long way when dealing with the ship's crew.