There was one episode where they were in Tennessee, and this old Southern guy in overalls and no shirt just had a bunch of stuff stuffed in his garage (as is typical with the places they visit on the show), and they found this massive...thing, and they asked, "What's this?" And the guy very nonchalantly was like, "Oh, it's a dinosaur bone."
They weren't sure if it was real or not, but they took a gamble on it, and it turned out to be a femur from some dinosaur that was dug out of a lake bed somewhere in the state. They donated it for study and eventually, I think, to be placed in a museum.
Crazy what people have just lying around the place. My grandfather was a hoarder, and he had all kinds of stuff, just stacked to the ceiling in his house, that he'd collected his whole life. Unfortunately, there was a fire, and he lost most of it. A shame--our family tree records went up in smoke in that fire. Really a shame.