Yep, wrecked a few arcade machines back in the day.. LOL.
It started when we realised that static from your body from wearing woolen jumpers etc and touch the door on old em's, some would put the arc across the coin switch and start it up.
Video games were not as easy due to the electronics as it sometimes upset the whole machine.. The spark guns for gas stoves put out a 12v charge when clicked and modified to expose the wires would sometimes work depending on the machine.
Best effort was the cotton attached to the coin and lowered into the slot until it triggered the credit, then pull it back as far as you can, hold the coin return button in and let go and the coin and string would come back out the coin return. I got banned for life at the local bowling alley for this LOL
Told the wife about our shenanigans and then had to prove it to her, lucky I had a pinball machine or two on hand and gave her a demo. Brought back a lot of teenage memories.. :)
Cheers: Brettski... :)