Divide the children into two teams and give a man's dress shirt to each team. Be sure each shirt has the same amount of buttons down the front. At the signal, the first person on each team puts on the shirt and buttons all of the buttons down the front. The one who is buttoned-up first gets to answer the question you ask. If that person is incorrect, the person from the other team gets a chance to answer. You can keep score or not. The students love it either way.