When looking for arrowheads in a corn field years ago I found a gob of rust that turned out to be a barrel and a bit of the hinge and frame of an ancient top-break revolver. When I cleaned the dirt off of it I found out that it had been in the "open" position when lost or thrown away, and it was probably broken at some point by a plow or harrow. It's amazing what I found looking for points; two old gob of rust pocket knives and two old mercury dimes come to mind. I'm sure whoever lost those dimes and pocket knives figured they would never be seen again.