I remember reading an incident in the life of Albert Schweitzer. A few years before his death, he was in the U.S on his birthday with a few friends, at a private party at a restaurant. After supper, the waitress brought him the cake, and after he blew out the candles, they gave him the knife to cut it.
There were seven people in the party, and Albert Schweitzer cut the cake into eight equal slices. He gave one to each person around the table, expressing appreciation for each one. Then it came to the last slice, he put it on the plate and handed it up the waitress, saying, "And this is for the young lady who served us so graciously through the meal.:" I suspect that just about made that waitress' day.