Say, from watching film you feel that your upcoming opponent is going to stack the box to stop your running game.
You, as OC may tell the head coach, "If they stack the box to start the game I want to run play action passes to the tight end in the seam, and we'll do it until they back that strong safety out of the box to cover him".
So it turns out you predicted correctly. The opposing defense stacks the box and you run three straight successful play action passes to the tight end. The crowd is going wild with excitement at the brilliance of your play calling.
Then, on the fourth play the strong safety takes the tight end and the middle linebacker backs up in coverage.
You then see that they've adjusted their defense out of the stack. So you run the ball. Your planning is 100% successful and you got the defense to do exactly as you wanted them to do.
Ultimately though, there'll be a bunch of fans saying, ""I can't believe we stopped throwing to the tight end. It worked three times in a row!"