My friend saw herobrine. He was playing in singleplayerand found a small house with a diamond block under the bed, took what he could and left. He saw herobrine following him and booked it home in time to sleep for the night. When he woke his house was burning and the windows were broken. There was a sign over his front door, which usually said "Snipers House" and it was changed to "you can not run". He instantly logged out and when he re logged the sign said, "I Will Wait" i also personally saw herobrine in a multiplayer server, where i was building and he appeared in a window for a split second then disappeared.