How did a get a piece of metal in my foot?

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I never wear shoes, summer or winter (inside). I walked around all summer outside barefoot...in the garage, in the workshop everywhere without incident. Last evening I stepped on something here in my office. I have a small rug under my chair and that's where I wound up with something in my foot. I assumed it was a splinter of some kind. I pulled it out and tossed it in the trash can and it made a 'clink' sound when it hit the bottom. This morning my foot was sore where it had been. I asked my husband to get out his 'tools' and check it out. It took out a needle and dug (not hard or I'd still be screaming) in my foot and there was nothing there. Good. So we went to the little trash can and I pulled out the piece to show him, it turned out to be a small piece of metal. We have no idea what it is or where it came from. I guess I can go barefoot outside but I'd wear shoes in here!