I was out in the yard watching my nephews for a bit this afternoon while dinner was being prepared. They were playing with a miniature badminton/tennis set, but they weren't using as intended. They're six and seven, so I cut them some slack. Anyway, I glanced away for a moment, and I hear the youngest shout, "You hit my boob!".
I turned around to see what was wrong. His brother whacked him high up on the chest, almost at the shoulder, with a ball. I told him, "That's your chest. Little boys don't have boobs."
I can't believe I said that.