Oh, and yet another story...............
We lived in a house that was over 100 years old. There was a strong scent of perfume that began somewhere on the steps of the third floor, went down the second floor hallway, down the stairs to the first floor, through the living room, dining room, kitchen and then would vanish at some point on the basement stairs. You could actually follow the scent. We could be in the living room watching TV and the dog would perk up, nose in the air. I KNEW what was coming. Sure enough, I would get the scent, and say to DH, "she's here. Coming your way........" DH would say, "No not yet. Oh, here she is. Headed toward the dining room now." This happened many, many times.
Just a wave of perfume that traveled throughout the house. Nothing else. No lights on and off, no doors slamming, nothing like that just the scent of woman's perfume.