When a team is winning, by a lot, they run a play allowing the big guys, who normally never get a chance to run the ball, to run the ball in for a touchdown.
The play is normally developed on the fly, and is done, not to score points, but to put on a great show for the fans, and in high school ball, to give the guys who have never held the ball a great story to tell.
Yeah, we were winning 56 to 7 at the half, so we put our defensive tackle in to run the ball. When he got it, our defensive ends ran with him. I swear to God the ground was shaking as they ran down the field. It really was a thousand pound touchdown.