Every Minecrafter knows about the ghost, "Herobrine." Whether or not he is real, however, is debated. "Pro-Herobrinians" claim sightings and screenshots as proof of Herobrine's existence, as well as Notch "admitting" that he was real, however that tweet is debated. "Pro-Truthers" believe that Herobrine can not exist, as there is no coding for such an entity to appear, and that any sightings are hoaxes. Other people simply don't care.