On the way home from pre-school yesterday, Charlie informed me that tomorrow his "arm will broke off." I assured him that it wouldn't, but he was quite insistent that his bones would break - he knew this because Ben told him so while they were in bed.
My suggestion that Ben was wrong was met with a flat rejection.
Since Ben is not the deliberately deceptive kind, I can only conclude that a conversation about teeth falling out (Ben is currently missing three), which involved an assurance that teeth were bones, has resulted in just a wee bit of confusion. Suffice to say that so far, Charlie's arm bones are intact.