Dyno Racing King!!!
Coaches usually do this for 2 reasons. First, they have supreme confidence in their defense. The second revolves around halftime. Ideally they'd like to score right before halftime and then come out and score again on the opening drive. That's a dagger for other teams. The other side of that is that if trailing, the offense gets a chance to review/change at halftime and then come out to set the tone for the second half right away.Traditionally, Mack Brown gives up the ball on the toss. Don't know why, but he's pretty consistant on that.
I've always wondered why all coaches didn't do this.