Was working on an old Wheel Horse Garden Tractor years ago (Still Have The Unit) I was working in the engine area and starting and stopping the engine. One time when I reached across to start the engine I also tripped the toggle switch that engages the mower PTO. The engine started and was running fine and my brain started saying the motor sounds funny. About the time my brain was deciding the motor sounded funny I looked down, my feet, toes of shoes were underneath the mowing deck and the deck belts were going around and around. The strange sound I was hearing was I was standing beside the mowing deck when it was engaged when I was usually setting on the Garden Tractor. I was very fortunate the slightest upward movement of my foot would have resulted in a very serious injury.I think about this each and every time I am working on something with a mowing deck attached.