While I was at my parent's house, three other houseguests were there too. In addition, they had some sort of party two out of the four days I was there. My parents are social creatures who thrive on having others around.
I'd walk around the house and, even if the room was empty, i could sense the presence of everyone else. I walked by the kitchen once and an unattended pot was mysteriously boiling. Walking back through a while later, the pot had disappeared and there was the faint scent of tea in the air.
I'd see some item, maybe a book or shoe, in one room and then later see it mysteriously appear in some other part of the house soon after. This happened enough that I started to suspect there was some sort of Underground Railroad for household objects.