[along-for-the-ride]

In this situation, Mom safely pulls into the nearest parking lot. Stops. Parks. Cut the motor off. Takes the keys. Only she gets out of the car and stands behind the car. During this time, she says nothing. Kids stop messing around, look at each other, say "huh?' and realize whats going on. They call for Mom and she gets back into the car and then discuss the situation and the possible consequences.

Or......

Mom hides a tape recorder in the car and records the kids acting out. Later, safe at home, she plays it for them so they can hear what they sound like. Mom then asks, "Would you like to be the driver when this is going on in the back seat?"