When drag racing, it's critically important to keep the car going in a straight line down the dragway. The driver of this Mustang Bullitt somehow missed that memo. Ouch.
It seemed like everything was going so well, he was already in second and pulling strong. Maybe he just realized he was about to lose to a wagon and bailed. Hey Pa, can you go fetch the rifle for us, because that's one Mustang with a seriously broken leg.