I went to a ladies dinner party, and one lady when she lived in a town about an hr away she had an oven where the door would open and close over and over. She said she would go to the stove, close the door and say knock it off. And that worked.
I also so an unsolved mystery show in the 80's where a lady said she had a ghost in her house and to let the lady know it was there would knock a whole loaf of bread on the floor, or something like that, and that lady would just calmly go over to the loaf of bread, pick it up and put it back on the counter, and say, "Okay, I know you are here, now quit it."