I'm glad no one was hurt. A similar thing happened to me when I was 16. I was babysitting at a neighbor's house. She called and told me that she was sending her friend's daughter over to pick up some cigarettes. The daughter would be driving my neighbor's car and when I heard the garage door go up, I should go out and give her the cigarettes. My neighbor wanted to make sure that the girl got the cigarettes and went straight home. She didn't want her friend's daughter to be out running around in her car.
When I heard the garage door go up, I went into the kitchen. All of sudden, I heard a roar and the next thing I knew I was lying on the floor on the other side of the kitchen. The girl hit the accelerator instead of the brake. Lucky for me, the stairwell to the basement was in the garage. It was in front of the interior wall. The car hit the wall and the back wheels lodged in the stairwell. If they hadn't, it would probably have run over me. I didn't get hurt badly, but it sure scared me. My neighbor wasn't all that upset. She got a new kitchen out of it. I didn't even get paid extra!