Speaking of Model T coils a favorite trick in the 30's and 40's was using a separate non grounded battery and electrifying the outside of the car body and the door handle. Simply shocking.

My uncle told me when he was in High School if the ground was wet you could throw a chain out with the negative ground and attach the Model T coil the the frame of your car. Then the idea was to slowly creep up on the unsuspecting and touch bumpers before they got out of the car.

When I was about six my older country cousins said lets see who can pee on that fence wire. It made a lasting impression as I was knocked to the ground and peed on myself. Boy they thought it was funny as heck, till we got to the house and my Mom asked why I peed my pants. Their Dad whaled the tar out of them. Too bad now days he would be arrested for child abuse.

John