I have been in the unfortunate situation of being the VICTIM of an attempted carjacking, the perp jumped into my car through an unlocked passenger side doorat a stoplight in Ft. Pierce FL, he held a knife to my throat, demanded that I drive. While driving he demanded my wallet, and instructed me to drive to a shopping center, get out and leave my wallet with him.
Him wanting my wallet gave me a chance to get a hand on the grip of my revolver which was holstered in an RH holster in the small of my back (I'm a lefty), when I got a grip on my gun, I slammed on the brakes and drew my gun, his head slamming into the dashboard made him drop the knife, and when he saw a stainless .357 aimed at him, his demeanor changed from violent to apologetic rather quickly. I ordered hiom out of the car on the passenger side and I followed, I kept him face down on the ground with my foot on his neck until the police arrived several minutes later, a store owner saw it going down and made the call.