Last week as I walked around a corner at the Mercatus Centre, I almost ran into Prof.Tullock shuffling away toward his office. To avoid confusion, I stopped, said hello to him and waited for him to make the first move. He returned my hello and said "Standing at attention when you see me and wishing me is the correct thing to do when you see me". So I saluted him and said "Yes Sir". Are you still wondering why he gave me an A+ in his class?