Dad's Electric Shock Prank

Back in the 1950's Dad was a Construction Superintendent for these two guys Joe Trackman and I can't remember the other guys name. They were homebuilders who hired Dad. They had daughter’s named Sharon and Elaine and called their development Sharlane Gardens. Dad had this jeep that was wired with this electric device that had a wire go under the seats in the from and back. There was a button on the floor that set off an electric shock. Dad was riding these guys around the construction site one day and decided to hit the button, of course everybody in the jeep except the driver got shocked. I imagine it was pretty funny. He did it several times before he confessed up. Oh yes he also tried it on us kids. Bob