Just so-so story

I've helped my 10-year-old brainstorm, as an English assignment, an original "just-so story" myth explaining the origin of an Earth custom; he chose, ambitiously, the origin of war. What we've come up with is that village disputes used to be settled by dancing competitions judged by the gods.

With the competition that became the first war, one problem was that the god in charge of deciding the dispute was widely rumored to be in love with a girl from one of the villages (and indeed, ruled her village the victor). But the other catalyst was that the dispute, taking place at a giant dinner party, was over proper table manners and utensil usage. The losing side, who felt that they had in fact danced better, were all "Never mind, the correct way to use sharp knives is like THIS *stab stab*". The old system never aroused enough trust again.