Lock, Look, Leave.
Lock your doors.
Look around and quickly check your surroundings.
Leave the area.
If you have a tendency to get into your car after shopping, eating, working, etc., and just sit (doing your checkbook, or making a list, etc. DON'T DO THIS!) A predator may be watching you. This is the perfect opportunity for him to get in on the passenger side, put a gun to your head, and tell you where to go. AS SOON AS YOU GET INTO YOUR CAR, LOCK THE DOORS AND LEAVE..