When David drives to the nearby village to make the phone call he parks his car facing the opposite direction he is to return. After the call and after his encounter with the village folks he returns to his car and drives off without reversing his car. The car was automatically reversed.
When David returns from the Public telephone In the village the Alarm Is blaring out and lights flashing on one of the cars. David runs Into the house with the alarm still sounding but a few seconds later the alarm mysteriously switches Itself off.