"That's not fair!" - my son to his sister, while playing UNO.
"You're cheating!" - my son to his sister, while playing the card game WAR.
"You're a liar!" - my son to his sister, while playing Candy Land.
The wise lady authors say, "To lose with a smile requires first of all that you do not care too terribly about the game -- and that you must be able to take a back seat once in a while. The ordinary Six-year-old has neither of these abilities. His emotions are violent and he cares intensely about almost everything. It is almost impossible for him to take a back seat. One of the cardinal rules in his life is that he wants and needs to be first."
Yeah, that's my boy ... at least, that's him when playing with his twin sister, who is, of course, also six.