Herobrine...

In all versions on the -666 seed, strange things happen, like on day 3 the torches disappear, and on day 9 many crosses appear on the ground; on day 18 holes appear that reach the bedrock; on day 29 the arches turn into redstone arches, and on day 31 several chunks are deleted; and on day 40 a player named steve1503 joins the game... then a bunch of stone crosses appear, and on day 80 the player gets in their inventory... 9 gold blocks, a netherrack block, a fireball, and 4 redstone torches; and when the player does the ritual, lightning strikes during the ritual; and on day 100 a player spies on the player, a Steve will glitch the world, kick you out, you rejoin and everything is corrupted; on day 109 the moon is red, the clouds are red, everything loses textures No animals, no monsters, just a world corrupted by a player who disappeared. On day 200, everything disappears; you're in another dimension, a world with the old Minecraft textures. Everything seems normal, the music is nostalgic, until on day 400, Steve appears on the screen screaming. When that's over, signs will appear in various places around the world saying things. On day 800, everything returns to normal, except Steve watches you sometimes. On game days, few animals will attack you.