That happened to my neighbor in TX. Their teenaged son backed the car out of the driveway and started down the street. Kittens fell out every which way. Unfortunately, they all died. Nobody knew where they had come from, as the family did not own any cats.
I once started the engine of my car parked outside and heard an awful row that I’d never heard before. I raised the hood to discover why and stared eyeball to eyeball with a very angry cat. It suddenly left for parts unknown like the shot from a gun.