I'm a pizza doctor, and I want to reconstruct what happens to a pepperoni pizza in less than 2/10s of a second when hit by a car braking from 70 kph over a breaking distance of 50 meters:

Even in a car equipped with ABS, the first impact will occur around 46k's. The bumper hits the pizza box holder, tearing the box from his hand. The full weight of the pizza smashes onto the windscreen. The box opens, the toppings go everywhere, and the pizza's dough is turned into pulp. In little more than a second, the pizza hits the road, with a 70% chance of being ruined.

And had you been breaking from 60k's, not 70, there's a good chance you could have stopped in time.