Overboard? They sure do!

Once, one of mine was at school when my spouse happened to go in to take care of something. When the class went past the office while passing from one period to another, my spouse waved, but didn't get a response. That night at dinner, SO asks DC, "I saw you at school today and said 'hi', why didn't you wave to me?" To which the answer was that the class had been instructed to be quiet and keep their hands to themselves, "but I looked at you!" Which apparently was the closest one could get to greeting one's own parent without breaking a rule, at least in DC's mind.