[Parke1]

Well let's see here. If he's on the other side of the car from me, I suppose I'd enter the passenger side and slide over to the driver's seat and leave. If he became aggressive at this point, I'd probably just drive away from him (to prevent damage to my car) and call the police.

As long as he remains docile, just get in the car, slide over to the driver's side and leave.

-Parke1