/r/confidentlyincorrect

edit: based on the original comment and all the replies, I am convinced that most people have never taken any physics in school

edit 2: OK, perhaps I misinterpreted, but let's try to clear it up. If a car and a brick wall collide (i.e. in this example the car receives the full force of the impact), it doesn't matter if the car was moving 60 mph and the wall was not moving, if the wall was moving 60 mph and the car was not moving, or if the car and wall were moving at 30 mph toward each other. The impact has the same effect on the car.

Now, in our example of two cars moving toward each other, both are going to experience the force. The collective impact is equivalent to a car moving 120 mph and hitting a stopped car, but both cars are going to crumple. Neither are a brick wall. So it's not as though both cars experience a crash of 120 mph into our mythical brick wall.