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Some years ago when the carjackings were becoming routine, South Africans
were taking some drastic steps to cause harm to the carjackers:

1. Car owners were installing shotgun shells under the driver's seat. I'm not
sure how they could fire the shell up into the BG's bottom when they were 'jacked.
I would not be a fan of driving a vehicle with a shotgun shell ready to shoot me in
case of a malfunction. Mechanical and electrical devices fail on a regular basis!

2. Something that was safer for the car owner, but deadly to the carjackers:
The owner would leave a liquor bottle in the glove compartment for the carjackers
to find after they had stolen the vehicle.
The liquor bottle had poison in it and the carjacker would die when he drank it.

SIA