An old Ford coil, grounded with a length of chain, concealed in the trunk of your car: that'll teach anyone who wants to mess with your chrome.
"A surprising shock awaits those who would hitch on to a car fitted with the electrical system here shown."
An Ammeter is placed between the coil and the car battery, to prevent the child in question from getting his fingerprints roasted off. Or, perhaps, to ensure that he does.
[Science and Mechanics via Modern Mechanix via BoingBoing]
