Hem of his shirt pulled all the way up to his chin with his elbows splayed, arching his back to make sure all the peepee doesn't dribble onto his pants again.
When he's done, penguin-walks his bare ass to the sink and asks someone else walking in to put the soap on his hand and press the water.
Finishes up with an intense fascination with the hand dryer that's almost impossible to understand. Goes back to his family wiping his runny nose on his barely-washed hands.