I thought this was a couple nails when I first saw it. turns out its a couple honey locust thorns. can anyone explain how this happens?? a thorn in the middle of a piece of wood. there was no crotches near or in this piece. I have seen this happen more than a few times. The first pic is the splits open like a book. you can see the thorn on the right side and the hole it was in on the left. second pic is a close up of the thorns.