Unicycle Watch 2008

Robin has finally gotten the hang of it so the Dynamic Duo can tool around together now.  As they passed by our house just now they were having some sort of argument and one threw something at the other.  And then they kind of circled around each other shouting.  And then they were both off their cycles throwing - of all thing - small cartons of milk at each other.  

Some thought questions: Why do they have so many little milk cartons with them?  And if they need so many so badly why are they so quick to start hurling them in the middle of the street ("Don't you mess with me or I will totally lose my calcium on your ass.")?  Or is this part of the training for the single-wheeled dairy cavalry neighborhood watch?

So. weird.