Life's Little Mysteries #3: Klumpy Kool-Aid

Why is it that Orange flavor Kool-Aid is the only one that clumps when you add the water and start stirring it up? You know what I'm talking about...those big clumps of powder that you have to break apart on the side of the pitcher with the spoon. None of the other flavors do that. Is there some scientific reasoning to explain this phenomenon? Someone out there please invent something to keep these clumps from annoying the piss out of me.