my Granddad said when they were young they connected up a Ford smodel T spark vibrator coil to a screen wrapped around a wood telephone polle that the town drunk would pee on every Saturday night. When the pee hit the screen it completed the loop to ground and ZZZZZZZZZZZZZZZZZZZZap.

A guy in high school had a nice car that people were always leaning on and smudging the paint. he rigged a Model T coil to a chain that he dropped when someone was touching his car. the toucher closed the high voltage loop and ZZZZZZZZZZZZZZap.

Another guy rigged a Model T coil to spark plgs in each of two exhaust pipes that came straight up just after the cab on his pickup. When he lit off the coil flames came out the pipe!!!!!!!!!

The Model t coil vibrated and put out a contiinuous high voltage to a spark distributer for the four plugs. The high voltage was always hot and was routed to each plug by a rotating high voltage distributer.

Wish I had one of those coils to play with now.