Have you ever found broken glass in a place where no one lives?

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We have a studio apartment. No one lives there. The windows were closed. My dad went there and there was a broken glass. No one was there to break it. I wonder what happened. The windows weren't broken. I can't imagine why that glass was broken if windows were closed. That studio apartment is near a cemetery. We want to rent it, but some people changed their minds when they knew that it was near a cemetery. I don't think this is a problem. That broken glass is a mystery. Maybe a stranger was there. Some knives disappeared too. But the door was locked. This is weird.