An employee and a coworker were installing sheet rock while standing on a bakers scaffold that was approximately 7 feet tall. The employee needed to reach higher so he was also using a step ladder on the bakers scaffold. His coworker climbed down off of the scaffolding and the scaffolding began to roll. The employee was on the scaffolding standing on the step ladder as it was rolling. The scaffolding tipped over onto its side, and the employee fell approximately 8 feet to the concrete floor, suffering a broken wrist, foot, and skull.