High voltage on perfboard

[RoGeorge]

 

[NiHaoMike]

Reminds me of an "analog computer" someone built decades back to calculate the shortest path between two points on a map. It was basically a map of some city (New York IIRC?) etched onto a PCB, with the roads marked as dashed lines and empty space everywhere else. To find the shortest path between two points, connect a high voltage transformer between them and give the board a zap.