I had that happen to me in a parking lot, and it scared the ever loving hell out of me. I cried for hours afterward.
I'm so glad no one was hurt. I agree with PP who said you need to bubble wrap your car. Or at least get Aance back here and borrow some of her sage to smudge the hell out of the car!
This happened to me at the gym the other day (I was the mom and my kid ran away from me in front of a car while I was holding my baby and car keys). It sucked and I'm still shaken up about it everytime I think about it. Luckily nothing happened to us either.