[lunarhighway]

a friend of mind had his car stolen, police tolled him there was little hopes of finding it again. yet a few days later he found it a few blocks away full, probably stolen by some kids to joyride... so he set up a simple toggle switch hidden behind a rag in his glove compartment.

a few days later supposedly the same kids tried again, but they left after they had drained the battery trying to start it...

problem is nothing keeps frustrated thieves frow wrecking your car.

another thing you might do is leave the glove compartment open to show there's nothing valuable inside (preferably leave it empty when you do)... saves thieves the trouble of brakeing a window