Play calling during the two-minute drill emphasizes high probabilities of significant yardage gains or clock stoppages. To help control the clock, teams tend to pass rather than run and to pass near the sidelines rather than the middle of the field. The former provides for incomplete passes while the latter allows the receiver to run out of bounds, both stopping the clock. When plays that do not stop the clock occur, the offense relies on a combination of hurry-up plays and spiking the football – a play where the quarterback stops the clock by immediately throwing the ball into the ground (sacrificing a down by doing so) – and time-outs to minimize time lost. Additionally, in college football, the offense can temporarily stop the clock by gaining a first down.