Hello! You may or may not have not heard of herobrine, (though you probably have, as just about every member on here have posted this) but I'm going to tell you about him anyway. Herobrine is a commonly believed story in Minecraft that has not been proven true. He looks like the default skin, except with white eyes. Basically, he comes and stalks you in your world and destroys it. There are many signs of herobrine. These include:
A tree with no leaves (Herobrine must love fall)
Random Glowstone towers (Herobrine must be one of the only people to love the way glowstone looks in the default. Yuck.)
Pyramids (Ah, so he's a fan of ancient Egypt)
Suspicious sign messages (Maybe he can't talk, so this is how he communicates)

However, the developers of Minecraft claim he has not, and will not, ever exist, so I guess it's safe to assume he actually doesn't exist. I'm usually more of a I'll believe it when I see it type of person, so I'm going to say as of now he doesn't exist. But you never know.

Hes really scary for some people.

I don't have minecraft

Herobrine can talk. His favorite quote is, "ONLY GOD CAN SAVE YOU NOW."

By the way, you might wanna avoid Entity 303, too...

What I find hilarious is that people say they haven't seen weird things until they have seen a herobrine video.