I think you should put at least one battery under the passenger seat, leaving the metal pan of the seat exposed, so that when someone sits on it, it shorts the battery, a'la Volkswagen Beetle.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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