The grain that popped out isn't "pithy" is it? If not, it's just too cool! I love to see accidents like that!
I turned a small cedar bowl on my lathe once. Just as I was turning in some decorative rings in the side of the bowl, a silver streak popped out. I stopped the lathe and found that I had found a lead bullet stuck into the wood! I though it looked interesting so I left it.
I donated that wooden bowl with the bullet in it to a charity auction, they got $200.00 bucks for it!