Wow! I'm not that old (47) and my dad had one of these old Ford coils stashed away. As a teenager a friend of mine and I did this!!!!

During the winters we use to get kids hanging on the bumper of the car and sliding behind the car on slick shoes. We called them hookie-bobbers. After hooking up the coil to my friends old 56 Chev metal bumper we waited at a corner for some little fool to hook up to the bumper, then WHAM! We set off the coil. Lots of fun watch their reaction.

Of course today, as an adult, I realize it was a stupid think to do, but at the time we had great fun until all the kids knew not to hook up to my friends car.