or you could buy a rabid pitbull and leave him inside the car.
or maybe a 6-foot long python
seriously though, lahat ng anti-carnapping devices may counter yung mga carnappers e. what if you take a small (yet essential) part of the engine with you when u park in suspicious places? hmmm
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o kaya may nakalagay sa labas na sticker "this vehicle is armed by viper" tapos maglagay ka ng cobra sa loob yun pet mo. pag tingin ng mga carnapper "di uso samin viper sisiw lang yan" pag bukas at upo nila ayun tuklaw hehe paktay deretso na sa kahon yan hehe