First of all you need to relax, if possible try any mess up at all, and keep moving.
Incase you have to stop and see what happened,
Relax, Get out of your car, See the damage, if its not too much you can move on,
If the hit is a big one, you should talk and sort it out mutualy, If your insured and ask them if they are insured, The insurance company can take it from here.
In some situations you have to hit and run aswell, For instance one time happened with me,
Their was a group of JANGLI bikers waving their bikes right to left on the main Korangi road, If you know theirs a clear rule of not over taking from left,
I was going on my way and out of no where from the left this ******* hit me from front fender to rear fender (fortunatly he had rubbers on his handle so nothing happened just burned rubber and was removed with a wet cloth.
But the thing that happened was i kept moving, Their was slight rush and some biker came off towards me, Banged my cars mirrors, At that time i fled the scene making way from wher ever i could.
I know i wasnt at wrong, And i know my neeyat wasnt bad,
But in such situations people should help one another and sort it out mutually instead of creating a fuss for either party.
Once the car is hit, You cannot reverse the situation now you can only decide how to get to the solution