More than 50 years ago, my grandfather was using his 8N with a rear blade. Finished, he parked it in the shed with the blade still raised and stopped the engine. When he stepped down, I climbed up and began to play. Granddad thought it was funny as he stood behind the tractor watching - until I shoved the 3pt control and dropped the blade on his foot. The blade landed across his toes, and he was pinned. Luckily, my father was also there and managed to pull the blade up enough for Granddad to get loose. It only took a couple seconds, but it was days before Granddad could walk without pain. Nothing broken, just badly bruised. I was devastated to have hurt that wonderful old man. From that day to this, all tractors, all implements grounded when stopped.
GS