Well, it probably had to happen. Andrew broke his arm this week (simple fracture of the radius.) He tried to jump up to some monkey bars, missed, and fell funny. Fortunately, Michelle and I were there and had the car close by. He'll be in a cast for six weeks.
Michael, of course, is capitalizing on this. He has discovered he can inflict a great deal of pain on Andrew if he (in Andrew's words) delivers a "critical hit" on Andrew's cast. Mean little dude.