Why????

Sometimes I sit and wonder why boys do the things they do...why are they putting a child on the tire swing and then putting a metal chair in the path of the tire swing and then pushing child/swing into metal chair and they think this is great fun...why are they riding their bikes in the yard as one of them uses a piece of a tree branch (pointy, sharp piece no less) as a spear to be thrown into the bike riders wheel. AHHHH! BOYS!!