Eldon was going to replace the light fixture in his dining room. He turned on the light and then went out to the garage and switched off an electrical breaker. He came back inside to see if the light was off, and since it was still on he went out again and tried another breaker. During one of his trips to the switch box his wife walked through the dining room and switched off the light. When Eldon came back in and saw the light off he proceeded to remove the light fixture.
Fortunately for Eldon he only received a small electrical shock, but it could have been a lot worse. Similar hazards occur at work daily. This is why lockout/tagout should be performed at every workplace and the principles followed at home.