The Eternal Question

Every parent who has more than one child has asked it. To my knowledge it has never been answered. I'm not sure the most brilliant minds in the world could come together and answer this eternal question. It's a tough one! What is it, you ask? Well, are you ready for it? Here it is...

Why, why oh god, must my children fight constantly??

Seriously! They're best buddies one minute. Then suddenly, they are trying to rip each other's head off. It makes me crazy and explains why I'm partially bald (well, not really, but you know what I mean). I love them, but if the circus comes by and offers me money for them it'll be really tempting!