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· Blaberus craniifer
961 Posts
Did this one year in a haunted house with a car battery charger. Hung a large metal screen 9(2'x3') along the back wall and attached the Neg clip of the battery charger for it. Then attached a large metal bolt to the Pos clip of the charger. To make sparks, I just have to swipe the bolt across the metal screen. :D Don't know how real safe it was, but it was really cool!!! No one got hurt as we kept the guest more than and arms reach from the screen.
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