So the old man was going on a trip while the old woman stayed home to listen to her police scanner. He inadvertently goes up an exit ramp, however, so he's going the wrong way down the road. The other people on the road quickly inform the police of this situation, and it's broadcast over the police radio. The old woman, hearing this, quickly phones her old man, "Look out Harold! There's a car going the wrong way on the road you're on!" He stares at all the oncoming traffic, and replies "It's not just one car, they're ALL going the wrong way!"