Place I worked at yearsssssssss ago. one of the older techs was working on a machine. Was a wide format machine. He was leaning over the top and reaching around the back. The customer noticed he hadn't moved in a while. They went to see what he was doing and discovered he was dead. He had had a massive heart attack and died on top the machine. Before his body was even out of the customers office, they had called to see if another tech was coming out to finish.