I've had herobrine in a PE world, but it was kinda creepy, it happened on a few worlds actually...
I was walking around getting wood, then when I let go of my finger, bits of grass and lily pads broke.
and on a server I used to play. not saying what server, it isn't a server anymore, I got chased by herobrine for 2 months, straight. I saw signs that said death, redstone, and heads. In survival, people kept getting teleported to a place called Herobrine's graveyard. The graveyard thing didn't happen to me, but it was really creepy. Don't even trust a small random breakage of a block, unless you are on multiplayer that never uses mods or plugins.