Today, while hiking in Pennsylvania, Bart found a rock about half a meter long and a third of a meter wide. It was perfectly flat.
"Wow!" he said, "This is quite a find!"
I remained unconvinced. Although northern Pennsylvania is not rocky compared to southern & central PA, rocks are far from extirpated.
I said, "I will give you a dollar if you carry it to New York."
It went into his pack.