7-1-7a The quarterback may not make jerky, abrupt movements that simulate the start of the snap and that are clearly intended to cause B to encroach are false starts. One such illegal act is the “bob,” which is depicted in PlayPic A. In the bob, the quarterback moves his head forward and back quickly, usually but not always in the same rhythm as the snap count. The shoulders may move as well. Another is the “chuck,” the movement of the hands from the snapper’s hips (PlayPic B) to their normal place under center. The head bob or hand chuck should be penalized whether or not the defense is drawn into the neutral zone. They are considered dead ball fouls for false starts.