I would like to hear that as well. lol
I know there are many theories on their nature.
I have seen them a few times and have had two different ones show up in my home from time to time.
One is tall and definitely human shaped (it seems specifically male) and runs down my hallway.
The other is short and of a more indistinct form.
The one seems as if it is not aware of me, ignoring me as it runs down the hall.
The other almost seems like it likes to startle me, because it will appear close to me wherever I happen to be.
I see no features or eyes as some have reported. No hat either (as is sometimes reported).
I have often wondered the true nature of these shadows.
I tend to discount the theories that they are demonic in nature because I have felt no threat whatsoever from them (other than the startle factor

).
I have begun to wonder if they are some sort of bleed-over from another dimension. If there are many dimensions (as the string theory of physics seems to show), this seems to me to be a reasonable explanation.
They do look and "feel" quite different to me than other spirits or ghosts I have experienced.
In other words: I wish I knew.

All I can say is what I think they aren't. I would be interested in what you think they are, Bobby.