When I was about 8 years old, me and my best friend found a rusted-out bryco [IIRC] .380, with "pearl" grips, between two fences.
I showed it to my older brother...he took it away from me and went to the garage, where he started tinkering with it, trying to get the mag out.
It pissed me off that he "stole" our gun, so I told my mom...she promptly chewed him out, took the pistol, and turned it in to the cops. That's the last we heard of it.
As an adult, I had a friend who sold used cars on the side, from his house. He found guns pretty regularly. The one I was present for, he had picked up a Mazda 323 from the auction, brough it home and started cleaning her up...we found a battered Lorcin 9mm under the front seat. He kept it, against my advice...looked like someone used it as a hammer, but it still functioned.