Lining up elementary school children and walking them through the halls is always an adventure. I've seen teachers do it many different ways. Yesterday I observed a teacher telling her students that when they stop there should be a "pair on the square" (meaning one pair of shoes per floor tile). I jumped into the line between some kids when I saw it to see how tight a fit it was...since I teach older kids. I thought it was a bit tight (granted I am not a small teacher) but I liked the "pair in the square" concept.
Another one I've seen at a second grade and below level is "hips and lips". Students who start getting gabby and grabby in line have to put their outside hand on their hip and their inside (to the wall) hand on their lips. I often threaten my fourth graders with that one :)
Would love to hear any other fun ways that teachers control hallway behavior.