This wasn't intentional. A little problem I encountered this morning. I'd taken the core aerator off, and was easing the tractor up to the deck to hook it up. I was standing beside the tractor pushing the hydrostatic pedal with my hand. It was just running at an idle. I had a block of wood holding the spring loaded push arms down. The block of wood somehow pushed against the hydrostatic pedal linkage. Before I could shut the engine off, the tractor had climbed right on top of the deck! Yup it's wedged between the two front castors. I jacked it up and let the air out of the drive tires to free it. No damage done, but it took two hours to do a five minute job! When I figured out I wasn't hurt, I had to laugh at what I'd done.