Print out the thread MsKitty put over in this forum a few months back regarding the man who wanted either her or her car (possibly both) and take it home to your wife. I think the title is "Almost Carjacked" or something like that. I had virtually the same thing happen to me as did Kitty. It was why I started carrying.
You cannot imagine how unnerving and scary it is until it happens to you. The police here say that if a man gets into your car with you, your chances of survival go down by 50%. I want all the chance I can get.