In most pool games, pocketing a ball and spreading the balls is the aim on the break. Straight pool is different. In it, the goal on the first break shot is to leave the opponent with a "safety". A safety means a situation where they opponent has no good shot. The reason for this is because the call-pocket rule—the rule discussed earlier requiring the player to call the ball they intend to pocket—"includes" the break shot. For that reason, if you break the balls hard, and even if you pocket many balls, you will not be able to go again unless you called one of those balls in a pocket and it goes into that pocket.