When I was eight years old, I went to stay with my much older brother for awhile. Back then he was fixing arcade games for a living in Missouri and Kansas. He needed to work during my visit, so it was expected that I'd just tag along wherever he went.
The first warehouse we went to had uprights as far as the eye could see, hundreds of them. He took a looong orange extension cord, plugged one end in the wall and walked down a row of games, plugging each one in long enough to show me how to open the coin doors and trip the switch wires to add credits.
Then he handed me the extension cord and went off to repair something. Repeat every day for a week.
Yeah. One of the best weeks of my life.