5% of Minecraft players know that:

The ghast noise came from C418's cat...
An enderman can pick up a rose
Squids can ride in mine carts
There is approx. 1 in a 10,000 chance that the title will say Minceraft, not minecraft?
A splash potion of harming will heal a skeleton and a
splash potion of healing will hurt a skeleton?
The spider is 1 and 1/2 blocks wide, not 2 blocks.
Notch almost called Minecraft "Cavegame" which was inspired off one of his original games called "Rubydung"
An egg has a 1/256 chance to hatch 4 chickens at once?
Endermen sounds are actually WORDS, but played backwards and distorted
Each chunk is made up by 65,536 block, but most is air
When thrown at a blaze, a snowball will do 1.5 hearts of damage to it
In real life a golden apple would weigh 154 tonnes or 340393 pounds. It would be like carrying a small blue whale
The creeper was made from Notch's failed attempt at making a pig! XD
It is possible to grow a tree above the height limit
Tamed wolves will attack you if you shoot yourself with an arrow?
if on soul sand, Zombies and Skeletons wont burn from the sun

The Truth about Herobrine

Herobrine is a rumored hostile mob, as well as the subject of much Minecraft creepypasta. Herobrine does not actually appear in the game's code, but is an urban legend. Herobrine wears the same skin as the default Steve, but with blank, white eyes. Herobrine has been rumored to be Notch's dead brother, a ghost, or a slew of other explanations. However, no concrete evidence to his existence has ever been found. This is the most famous story about Herobrine:

I had recently spawned a new world in single-player Minecraft. Everything was normal at first as I began chopping down trees and crafting a workbench. I noticed something move amongst the dense fog (I have a very slow computer so I have to play with a tiny render distance). I thought it was a cow, so I pursued it, hoping to grab some hides for armor.

It wasn't a cow though. Looking back at me was another character with the default skin, but his eyes were empty. I saw no name pop up, and I double-checked to make sure I wasn't in multiplayer mode. He didn't stay long, he looked at me and quickly ran into the fog. I purused out of curiousity, but he was gone,

I continued on with the game, not sure what to think. As I expanded to world I saw things that seemed out of place for the random map generator to make; 2x2 tunnels in the rocks, small perfect pyramids made of sand in the ocean, and groves of trees with all their leaves cut off. I would constantly think I saw the other "player" in the deep fog, but I never got a better look at him. I tried increasing my render distance to far whenever I thought I saw him, but to no avail.

I saved the map and went on the forums to see if anyone else had found the pseudo-player. There were none. I created my own topic telling of the man and asking if anyone had a similar experience. The post was deleted within five minutes. I tried again, and the topic was deleted even faster. I received a PM from username 'Herobrine' containing one word: 'Stop.' When I went to look at Herobrine's profile, the page 404'd.

I received an email from another forum user. He claimed the mods can read the forum user messages, so we were safer using email. The emailer claimed that he had seen the mystery player too, and had a small 'directory' of other users who had seen him as well. Their worlds were littered with obviously man-made features as well, and described their mystery player to have no pupils.

About a month passed until I heard from my informant again. Some of the people who had encountered the mystery man had looked into the name Herobrine and found that name to be frequently used by a swedish gamer. After some further information gathering, it was revealed to be the brother of Notch, the game's developer. I personally emailed Notch, and asked him if he had a brother. It took him a while, but he emailed me back a very short message:

I did, but he is no longer with us.

-Notch