Employee #1 was using an oxygen-acetylene torch to weld a sign to the top of a school bus in the southwestern bay of a six-bay garage. While performing this task, he sprayed water from a fire extinguisher onto a coworker walking by the bus. In retaliation, the coworker picked up a hubcap filled with liquid he thought was water (but was actually gasoline) and threw it at Employee #1, who was welding. As a result of this mutual horseplay, Employee #1 suffered third-degree burns over 90 percent of his body. The causal factors were lack of supervision, unsafe work practices, and, most importantly, an open container of gasoline in the garage.