You know, I was very interested in Herobrine a while ago. I looked him up on the Minecraft Wiki, to see if there was any proof for him. I didn't believe it. But I changed my mind when I told my friend about him, I explained everything about him, but when I showed him the Machinima video that explains the history of him I got a bluescreen, and when I turned the computer on I had 11 viruses, all where spyware and trojans. So my theory is: Herobrine exists. He lives in our worlds, but we can't see him. Our worlds are 8 times bigger than earth, so we can't find him. But if he finds our houses he will grief them. That's my theory.