im sceptical, but i think maybe something like that is exist, i remember i was home alone, it was evening and there was black out, i started to hear noise from the kitchen like someone roaming in the trash bucket, finally i decided to take a look - when i entered the kitchen - noise of something roaming through the trash can stopped and changedwith sound of water dropping from the cellar, i trailed direction of the noise with my hand, but the surfacewas dry. I went even to take some nap, then after some time i heard something heavy dropped in the kitchen but i didnt bothered to take a look what it was. When black out was ceased, i went to the kitchen to observe what exactly was dropped here - i found nothing. Though maybe it was some coincidence - it was creepy