Back around 1986 we had a Blazer broken into. All the interior trim pieces were removed. A couple of months later the vehicle was stolen. Then I wrote a circuit for an alarm which blares a loud horn whenever the driveway is entered (at night...daytime break-ins like you described are not as common here). Since then nobody has stolen anything. I have thought about adding to the siren an MP3 file that will play the racking sound of a shotgun, but some richardhead would probably sue me for mental anguish.
