I have the NSX key on one side of the detachable keychain and the rest of my keys and the alarm transmitter on my person. If I'm ever carjacked, I can simply let the lowlife get into the car then hit the remote to kill the engine. That will give me enough time to draw my weapon, approach the car and ruin the scumbag's day. It wouldn't be the first time I had to brandish a gun in self-defense either. Thank God I never had to fire though.