Gun, string.
Mount gun on dash, pointing at driver's window. Attach string to trigger, other end to door.
Make sure gun is loaded, and string is just long enough that you can't get into the car, but you can open the door about 5 inches without it going off, so you can disarm it if you know it's there.
Frankly, I believe that car alarms are like door locks. They keep honest people honest.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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