Get two copper tubes and a water heater transformer (something that steps up 120v to at least 10kv). Attach the pipes to the secondary windings, stand back, and plug the bitch in.
https://en.m.wikipedia.org/wiki/Spark_gap#Visual_entertainment
Jacob's ladders are so cool
What’s really cool is my dad helped me make one when I was 14 and I was destined to become an electrician ever since!
I love electricity. I built a lichtenberg device and use it to make wooden art furniture. If you haven't you should try. Just get 2 grounded plug wires, a gcfi outlet and box, a microwave or neon sign transformer, and a pair of jumper cables and wire them up and screw em to a wooden board.
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