Banging On Basement Pipes And Nasty Get Out

I was sitting at the computer in the playroom and I heard this noise , like someone or something banging on pipes coming from below my feet. I went out to the dining room and I heard the same thing out there and got an uncomfortable feeling along with it. I was in the kitchen next looking around and from the dining room I heard a nasty "get out" and got the uncomfortable feeling with that also. As I type this in now I am hearing a knocking coming from within the wall by the stairs to the upstairs and a very uncomfortable/scared feeling. I have no idea what it is, but it doesn't seem like anything good.