With Minecraft as an exception, it seems that all popular video games are being infested with evil spirits that up the console's specs, add an invisible camera to cake a picture of the players, and pretty much changes everything to whatever the heck makes it scary.
And about Minecraft, I heard that Herobrine was Notch's bro that died in the middle of Minecraft development, and Notch programmed him into the game as a character with soulless white eyes that would appear so rarely that you would break bedrock with your hand before he came by for a visit.