It's rude to tell someone to pound sand.
David is driving his friend home from school, but they are arguing about something.
David wants to end the argument.
David continues a dialog with his friend while making sure he gets him to his house.
David pulls the car over to the side of the road a long ways from his friend's house and insists they get out and walk home.
David's friend is understanding, and they hash out their issues before the end of the ride.
David's friend informs David that their friendship is over and walks home.