Rolling rolling rolling

I was surprised last week as I drove home. A car pulled out in front of me with very little warning. I stopped the car and waited for it to drive off. Then I realised that there was actually no one inside. The car had just rolled out onto the road by itself. Probably the driver forgot to put on the hand brake. So I got out of the car and pushed it back to the side of the road. Another man found a rock to put under the wheel so that it wouldn't roll out. Funny.