i get shcoked everytime, that is untill i got smart....... just before you exit your car DONT MOVE IN THE SEAT. open the door a little ways, then touch something metal on the door. if you dont move in your seat you wont get shocked. keep holding onto the metal part and get out. dont let go untill you are completely out of the seat. then shut the door. you will not get shocked.
the reason why of course is because you are grounded to the metal, and by touching something metal AS you are building charge (by moving in the seat), the charge becomes disapated.
do this everytime you exit the vehicle and i can garruanty you wont get shocked!