Good question. our house was built on what use to be a dairy farm. this dairy farm had slaves and its a safe bet that the slaves burial ground, is was located on our property. we can see the indentions in the ground. anyway, our border collie is very intelligent and sees and hears things that we do not. he is constantly looking to the top of the ceilings in our house and over our shoulders. counting the sounds in our house would be impossible. we have had brooms to fall over onto the floor and my wife swears she sees dark shadows moving down our hallway. i believe something is here and the graves have something to do with it. my dog hears more sounds that either of us. his hearing is a 1,000 times sharper than mine.