Ever heard of a bezoar stone? It's a mineralized hairball sometimes created by the digestive systems of ruminants like cows, llamas, or, in this case, camels. I'd been looking for one ever since my last camping trip, which was back in April or May. Today I just happened to be telling my friend Paul about them as we were driving across the desert west of Riyadh. "Keep your eyes open for a softball-sized sphere," I told him, "Kind of like that one right there."
Sure enough, next to the skeleton of a camel or a goat (Yes, I know there's quite a difference between camels and goats, but there wasn't much left of this one so it was hard to tell.) this fine specimen was shining in the sunlight.
Apparently, these were much sought after in ancient times as an antidote for poison. Unlike some remedies, these actually have the ability to remove or neutralize arsenic, according to this source: http://curiousexpeditions.org/?p=371#comment-6346
How about that? Now if anyone ever tries to slip me an arsenic mickey, I'll just dip my bezoar stone in it and I'll be just fine. Now if I could just get it to fit into my pocket...