In Fresno, California, police stopped Randy Smith, who was walking around with a 'Super Soaker' water gun, which had been converted into a real gun, carrying a shotgun shell.
Smith now faces several charges, including being a convicted felon in possession of ammunition, a felon in possession of a firearm, manufacture of an illegal weapon and a misdemeanor warrant.
Ironically, the police officers had just been briefed about people turning toys into shotguns.
Sergeant Mark Hudson told KMPH News: "He took the Super Soaker apart, was able to fashion a barrel to where he was able to make what's considered a zip gun, where you can fire one round through it. In this case it was a 20 gauge shotgun shell."
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Bill Mayfield, who works at Gilmay Guns in Fresno, added: "The guy that made that gun, he probably got maybe $30 worth of parts. The firearms cartridge with the gun powder is an explosive. The device they're building has to be able to contain the pressure of that explosion."
"So they're just relying on, maybe this will hold up. Well, you could be putting a gun next to your head, or you could be putting a hand grenade next to your head."