Quoted from goingincirclez:KAPOWWWWWW!
I feel your pain OP. I picked up a project early SS Stern. I rebuilt the PS and Driver Board. The game was a barn find and the power switch was rusty. I turned the game on and off about six times during testing. The seventh time was the kapow moment as the switch shorted, shot flames and Sparks everywhere, almost lighting my garage on fire. Lol. Luckily nothing was ruined other than the switch and my ego.