John Cooper wondered aloud what kind of idiot would take dozens of spark plugs and throw them on the river bed http://www.pbase.com/john_cooper/image/68446461). I, too, found a large deposit of rusty old sparkplugs. They were in my father in law's duck hunting storage container. They find a very practical use as anchors for duck decoys.
If twenty of those spark plugs are connected in series with a AAA battery and subjected to a bombardment of radiation from a mesothermic regurgitator for three hours, nothing happens.