Herobrine!!

No this is not a mod. no this is not altered. I was playing on a server by myself, just a couple other people on, when Herobrine showed up in my house. I was too startled to hit the print screen button, and before I could regain my wits he had vanished. A few seconds later he attacked another player in the server, who was in creative mode. that player died, and say from the death screen Herobrine walking over him. We were discussing this when he showed up in my house again. This time I managed to hit the print screen button. Shortly after I hit it he disappeared again. A few minutes later he again killed the same player who was still in creative mode. The only other player on the server had seen nothing and wasn't sure he believed us, until we said we got screenshots.
Since a few people have asked, here is the IP for the server I was on: mc.omega-craft.co.uk *edit* sadly the server has been taken down as the staff could not keep up.