That's the one scary thing about used cast iron. It gets left all sorts of strange places (sheds, garages, etc), and can get used for unintended things. I was planning to buy a DO at a flea market one time until the guy blurted out about how great it was for melting lead in. Apparently he was using it to melt lead for making fishing lures. I bitched at him for a few minutes about trying to resell it as a cooking vessel, but he didn't seem to see the big deal. According to him, "No one cooks in these old things anyway".