This is an update to the "Scary Ghost Video" post. Since I got so many hits on this video post, I got curious to see if it's actually authentic or not. I did an Internet search to find out the story behind the video clip. I found the website of the guys who shot the video. On their website they've written down the whole terrorizing story and also posted some pictures. So, check the website out.
It was actually funny to see them run down the stairs screaming like pansies :)
If only they could have kept the camera straight only for one more second then they could have got a very clear and focused picture of whatever that thing was.