My family was visiting my grandparents for Christmas. It started snowing, so my younger brother, who was about four years old at the time, wanted to look outside. He was kind of short and couldn't reach the wimdow, so he ran over to a treadmill to stand up on it so he could see. I quickly ran over, turned the knob all the way to the rabbit setting, and pressed the power button. He was standing sideways on it, and didn't stand a chance. Poor kid had a nasty rugburn on his face for a month.