That's what helmets are for!

AAA was passing out bike helmets today, so we got one for Benedict and one for Emanuel. They chose Lightning McQueen stickers at Walmart and decorated them. Emanuel immediately put his on and began banging his head into everything- walls, furniture, his brother- as hard as he could.
"Emanuel," I said, "stop that; you'll hurt yourself."
He answered, "No I won't. I'm wearing a helmet!"