Courtesy of links provided by multiple correspondents, today's winner comes from Florida.
A sworn complaint was filed against William Daniel Lloyd, 31, for discharging a firearm in public and possession of ammunition by a convicted felon, Officer Ben Tobias stated in a press item.
Officer Diana Mattern responded to a medical emergency call at 600 SE 12th Terrace and learned that Lloyd had taped the cartridge to the end of a BB gun to shoot a squirrel, Tobias said.
Lloyd fired the BB gun, causing the BB to strike the cartridge’s primer. The cartridge discharged and fragmented, striking Lloyd in the upper arm and lower leg.
He was taken to the hospital with non-life-threatening injuries.
There's more at the link, including a photograph of the hapless felon.
Clearly, Mr. Lloyd had never bothered to do a little research on what happens when a cartridge is ignited outside the chamber of a weapon. He doesn't need to do it now . . . he found out the hard way!