About 5 steps ahead of me, I see her stump a toe on this mysterious wood block. All of a sudden I yell "Oh s**t!" as the old junky car starts rolling down the hill. Luckily my legs were built up and we were able to push this old heap back into its hole and scotch the chock under the wheel again. I can only imagine what would have happened had Sis been at her normal position, a few steps behind me!