I thought I had a visit from a ghost cat a couple of weeks ago. Was sitting in the living room where we have quite a few cat toys, including one of those round things with the scratching pad in the center and a ball that rolls around in a "moat" (for lack of a better word). No one had played with it in at least an hour, when all of a sudden the ball started rolling. Katie was on my lap at the time, and she was mesmerized by it. For some reason, I said, "Tucker?" and the ball stopped. (Tucker was the first cat we got after we got married; he's been gone for 22 years, but he was my baby boy and I still miss him)