I Question Your Commitment To Sparkle Motion

What could be the reason behind his laughter? What is it that can make a man seem this happy? Where does this joy come from? I don't think I've ever seen anyone look this happy before and I must know the reason behind it. The German kid with rickets that lived down the street from me in second grade didn't look remotely this happy when his new prostethic came in. And he was happy.