Baby Physics

What is it about the law of baby physics that dictates that spit-up will flow precisely in the opposite direction of a burp cloth? I could have Whit mummified in burp cloths, and he would still find a way to get it on his clothes or on me or on the chair or on the couch (or down my shirt as he so kindly did yesterday - a nice warm milky trail from chest to belly). Apparently this law also applies to pee. We all know that little boys are prone to playing fire hose, but again, I could have a tent of diapers covering his privates, and he would still find a way to paint the wall in urine. Perhaps he is telling us he would have rather had a yellow nursery? Thank goodness for the yellow chair at least - it covers all manner of spilled and leaked sins:)