Because of an emergency

Mr. Smith left his car outside his apartment one night as usual, but when he came down the next morning to go to his office, he discovered that he car wasn't there. He called the police and told them what had happened, and they said that they would try to find the car.

When Mr. Smith came home from his office that evening, the car was back again in it usual in front of his house. he examined it carefully to see whether it had been damanged, and found two theatre tickets on one of the seats and a letter which said, "We're very sorry. We took your car because of an emergency."

Mr and Mrs Smith went to the theatre with the two tickets the next night and enjoyed themselves very much. 

When they go them, they found that thieves had taken almost everything they had had in their apartment.