I'm surprised no one has resorted to chemical warfare. Add a can of skunk spray under the driver's seat, wired up with a motor to spray it if someone else tries

I'm surprised no one has resorted to chemical warfare. Add a can of skunk spray under the driver's seat, wired up with a motor to spray it if someone else tries to drive off in your car. Have an audible beep a few times before it goes off, to remind YOU to hit the secret switch to disable it. Car thieves will continue on their merry way, wondering what that beeping is. Of course, you'd probably be sued by the car thief, who wouldn't spend a minute of jail time because city governments don't want to do their job, so probably not actually a good idea... (Maybe instead of skunk spray, you could turn the radio up full blast, playing some CIA-approved heavy metal music?)