Several arrowheads, including a larger spear point while chasing elk in eastern ID and a small well formed point while belly crawling for lope in WY. But the coolest thing was an old pocketknife, on a very steep slope elk hunting WA. It's probably from the 20s/30s, still very functional, ended up being under a large old growth hemlock, probably a good place to stay dry during a rain storm. it's my everyday carry.
I also found a stone pedestal and mortal, on some friends ranch land in WA.
My buddy found a wad of money bird hunting, 350-ish in small bills.
IN terms of weird things witnessed...another buddy was sitting on a wet meadow during archery elk (I was sitting a different one about 1/2 mile away), not super deep but well over a mile from a road, and a guy wearing only tighty whities came walking through the meadow carrying a cardboard box, it was raining heavily.