Car with no Driver

Yesterday Greg and I went for a walk. It was nice. We were chatting with our neighbors for a bit on their driveway (their backs towards the garage) When all of a sudden I notice their car rolling towards us. I started to try to tell them to move but they weren't getting it. Finally I started screaming and kinda pushed them. The woman dove for the grass, and Greg and the man got in the way and tried to stop it. All the while I was still screaming at everyone. Once the car hit the street and leveled off, the MEN got it stopped. Good thing cuz it was headed for the model home across the street. That darn car near killed them. It was a bit crazy.