That reminds me of when I was about 21 and working at a grocery store in Texas. When the store closed at night, the whole night stocking crew would go to the back and unload the truck with motorized pallet jacks. Somebody did something to them that made the speed restrictor stop working and they would go twice as fast. We'd race them up and down the aisles the back of the store outside. I am surprised that we never broke anything. That was so dangerous in hindsight, but we were kids and there was no manager there.