This is no joke, I found Herobrine in Minecraft 1.3.2!!!! Unfortunately, no pictures... :( But I am not joking, this is 100% true!!! Heres the story:

I created a new world in Hardcore. I used 404 seed, I just typed in random numbers and decided to go with 404. I set Render Distance to Tiny, cause my computer was running slow, cause it was doing background scans. I spawned in a normal, average forest biome in a small mountain range. I cut down a tree and made a crafting table, pickaxe and some wooden planks and moved deeper into the forest and decided to build a house under a normal tree, I didn't destroy it, I just built a house underneath it. It got dark and the moon came up, I huddled in the house and crafted a few things, when I realised, no mobs outside, no cows, no pigs, even at night, no zombies or skeletons, I checked around... nothing. I was completely alone... I mined down in a staircase, making it turn, so it didnt just go in one direction, when I found a cave... Still no mobs... I got some coal and iron and returned to my house when, this is the wierd part, the forest biome had become a jungle tree forest in a snow biome and my house was half destroyed!!!!! The tree my house was underneath was destroyed and there was ruins of destroyed trees all over the place!!! There were jungle saplings lying on the ground all over the place and, this part is freaky, I was in singleplayer.... There he was, standing in the foggy distance, Herobrine, I saw him from my ruined house...