Can You Guess What Was Stuck In My Tire?

Let's play a game: Can you guess what this thing is that was destroyed the rear tire on my car? (Seriously, I have no idea what it is, or where it came from.)

I came come from the grocery store yesterday and heard a wild hissing sound in my garage. That hissing sound turned out to be the air frantically escaping my car tire due to the near-five-inch hunk of metal that had somehow lodged itself in there during my drive home.

I have gone through a fair number of flat tires in my life. My tires has fallen victim to of screws, nails, railroad tracks in need of repair, hubcap pieces, even a piece of wrought-iron in a parking lot. But this mystery metal has me baffled.

It's about 4 1/2-inches long, 2-inches wide and about 1/4 of an inch thick. It looks like steel with some rust on it, and looks like it had to have broken (or been cut) off of something else. How it came to be lying in the middle of a road somewhere on my errand route, I'll never know. Nor will I ever figure out how it was sitting at an attack angle the placed it in perfect position to deliver a death blow to my 8-month-old tire.

I feel like I may have drawn the short-straw when it comes to flat tires in the past 2 years or so. I think, since 2011, this is my fifth flat. And the third out of those five that has required  a new tire and not just a repair.

Hey karma, bite me. (Or would that be "car"-ma?)

Oh well, I think this probably falls into that "first-world problems" category. C'est la vie.

What is the strangest thing you've ever found stuck in your tire?