John showed up at the door limping and dripping blood. Dad: "What happened?" John: "Skateboard. Going down the hill and developed speed wobbles. Decided to jump off and cratered". Dad thinks "speed wobbles?"
At Urgent Care they say oral antibiotics, maybe a skin graft for the worst of the missing flesh on his hand and comment that about 1/2 of the broken bones and scrapes they see are from skateboard accidents.
John argues for a week off of school.
Two weeks later he is healing up nicely, no skin grafts required.