Hit me in the head with a rock

We're camping at Lake Granby. Leo keeps wanting to play this ridiculous game where he throw two handfuls of gravel above his head and then covers his head with his hands so the rocks don't fall on his head. This is the second night he's done it. Yes we've told him to stop. So Paul finally tells him that if he wants to get hit in the head, Paul will do it for him. Leo says ok. Paul says ok, let me get the hammer. Leo says, "No! Not with a hammer! With a rock!"