Good Arm?

I told Samantha to clean up after they had been painting at our kitchen table. KayDee was painting rocks with water and Sam wanted to do it after she was done with her paints. I told her to put the rocks outside and throw the newspaper away when she was done. She listened and obeyed. Then she came back in and said there was a crash and the window on the jeep looked different. I was really confused so I went to see. She had thrown the rock off the deck, across the driveway and it landed in the jeep on the opposite floor board of the shattered window. We had to teach some remorse but she helped her dad clean it up with the shop vac and put in the new window (luckily we had one in the parts jeep in the pasture). She had a good arm and it was a sharp rock.