Maybe the passenger was guilty for the wreck. I have a personal driver drive me around 4-5 times a week and I normally yell at him, But some times push and punch him in the head. Now that normally does not cause a wreck but if you punch the person driving in one of the eyes and they can only see with one eye then it does cause a bunch of problems. Far aswell the shock value of punching them in the eye, with one eye open they loose depth perception. They dont have the ability to judge distance. Thats why you dont see a one eyed person with a license. Anyway, it is possible the passenger punched the driver in the eye, causing the whole ordeal.