My in-laws have a early 1700s house in Maine. When they moved in, they found a very old bonnet, and some letters to "Lydia". They had some incidents over the years, and after my step-MIL passed away, my FIL got remarried and they started doing some major changes in the house. That's when the incidents started up again. Lights going on and off, things flying off the mantel. Nothing has happened since then, but they think Lydia is still around.

Just today, my friend was telling me about when she lost the diamond out of her ring. She looked everywhere and finally gave up. One day she was feeling really down. Her father had passed away, and Christmas was coming. She opened her drawer to put some clothes away, and there was the diamond, right on top of her jeans.