I mentioned in the comments over there that when I was a kid we kept a gallon jug of water in the refrigerator in the summer. No fancy water-and-ice-in-the-door refrigerators then. We had one problem with the water jug though. The rule was that whoever took the last of the water had to refill it. So we would get down to about an inch of water in the jug and everyone would start drinking water from the tap. After a while of waiting each other out someone would finally give in and refill it and would feel a bit like a hero and a martyr for being “more responsible” than everyone else.
I just got to thinking about how silly that was. How hard is it to fill a jug with water and put it back in the refrigerator? Sure a gallon of water is heavy to a little kid but we did more strenuous things just playing. It seems there’s something about “work” that always makes us want to get out of doing it, even if it’s not difficult or unpleasant. Just label it work or responsibility and we’ll go out of our way to avoid it.