License plate joke

One day, Mr. Wang and Mrs. Black went shopping by bus. They parked their car near a shop. They bought a lot of things. They want to put these things in the car. But Mr. Black can't open the door. "Get a policeman to help us." Mr. Black said. They called a policeman to help. The police were very kind to help them open the car door. Just then, a man walked by and shouted, "What are you doing to my car?" Mr. Wang and Mrs. Black looked at the license plate number and said sorry to the man.