"Personal space" means nothing to you when you weigh 2,000 pounds.
Buffalo have a complicated relationship with cars. If they're not head-butting them, they're sticking their giant stinky heads inside to get pieces of bread from some poor woman. It's just a good thing the driver didn't bring the car to a complete stop, or those frantic giggles might have turned into genuine screams. What do you think the buffalo does when the bread runs out? I don't know, and I don't want to know.