Anti hijack buttons on cars in S Africa were common place. The device worked like this: whenever a door was openend (as would happen in a hijacking), you'd need to subsequently press a hidden button. Without pressing the button, the motor would cut out 2-3 minutes later (some worked on fuel, some on electronic ignitions). It got to the point when hijackers would make sure they asked where the button was before driving off - and so was not so useful. Also, people started to focus on escaping the incident alive rather than trying to recover the vehicle.
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