Why do items break so much faster in The Aether? Because they'd have to be much less dense than earth materials to float so high!
Why do Overworld tools have no effect? Because you're in Heaven, and objects from the Overworld are too foreign to do anything noticeable.
Why can't Ghasts see through glass? Because they don't use vision as a primary sensory mechanism, as evidenced by the fact that they only open their eyes when shooting at you.
Why don't Creepers burn in the daylight? Because they are full of gunpowder so if they were set on fire, they would explode automatically. So they evolved to the point where they were immune to the sun's harmful rays, and flint and steel does not cause them to explode.
When Notch announced that monsters would spawn in dark places, he also mentioned "[they could spawn] possibly under your bed". Guess what can happen when you sleep on a bed.
Cobwebs appear in abandoned mines. They are really hard to break with a pickaxe or a normal ax (and the hand), but drop almost instantly when you hit them with a sword and drop a piece of string. You're not breaking the cobweb, you're cutting it.
Which just raises more questions, like why Steve? doesn't just break the cobweb. Or take more than one piece of string from it.
Wolves are currently only healed by porkchops and rotten flesh. Rotten Flesh seems like a rather odd food to intentionally make edible for wolves, unless you know that human meat tastes like pig meat. To your dog, it's just a rotten porkchop.
Endermen won't attack if you're wearing a pumpkin mask. They can't see where you're really looking.
Also, the mask directly obstructs the crosshair in the middle of the screen. You literally can't look right at them.
Mobs in Minecraft drop things relevant to them when you kill them, like string from spiders. But then there's zombies, which dispense feathers. What do feathers have to do with zombies? Well... zombies are pretty dumb, aren't they? What's another word for dumb? featherbrained. —Kaiser Yoshi
Wolves can't tell the difference between lava and water. This seems stupid, but wolves are colorblind.
Redstone Repeaters made enough sense already, but their crafting recipe seemed a bit odd. Then I looked at the double-inverters people used before repeaters ◊, and the crafting recipe for repeaters... ohh!!
Basically, people would hook up two NOT gates (inverters) in the form of two redstone torches with redstone in between (on top of whatever block was convenient). The input would remain the same as the output but would be good to go for another 15 blocks. The Redstone Repeater crafting recipe is two redstone torches with redstone in between on top of some blocks.
What are Elite Mooks of the game? Endermen. Where are they most commonly found? Protecting the final boss.
I realized something when I saw an iron golem defending a village. The iron golems are perfect for protection! Think about it. They do massive damage, they have an amazing amount of health, and the most important part? Their attacks launch enemies a dozen meters into the air. Specifically, an enemy that will be exploding a millisecond later.
Notice how small foods like apples and cookies never seem to keep that hunger bar from dropping again while more wholesome foods like cooked steak keeps the bar full longer? Each piece of food has different amounts of hunger saturation (a hidden game mechanic), so the more saturation the food has, the longer your character stays full before going hungry again, just like in real life when eating cookies won't keep you full in the long run but eating a big juicy steak will. There's even more fridge brilliance with zombie flesh where if you eat it, there's a high chance you may get food poisoning and your hunger bar drops incredibly fast. It's almost as if you are hungry all the time like a zombie...
Have you noticed how diamonds are found near lava most of the time? Diamonds are known to form in volcanoes.
If you try to use a bed in The End or The Nether, they will explode. This troper wondered about this for a while, then finally made the connection: what do beds do? They change your spawn point. Now imagine if you made a bed in the Nether, slept in it... and then destroyed your portal. If you had no Obsidian, then since water evaporates in the Nether, there would be no way to get more. Normally, you could just die and respawn in the Overworld, but you changed your spawn point. You're trapped- FOREVER. Ditto the End: there's no portals, so the only ways out are either killing the Final Boss or dying. But if you set your spawn there...
Why does the bed explode, though? If you want to sleep in one, it has to be night time. When you wake, it'll be morning. What do the nether and end lack? A day/night cycle.
Why do Witches drop sticks, sugar, redstone dust, glowstone dust, empty bottles, gunpowder, or spider eyes when you kill them? They were gathering up the materials for potion brewing and nearly every one of those items are a part of a recipe for potions that you usually make.
Nether Portals are probably 3 blocks tall because they aren't meant for us, but Endermen. Hence the particles and coloring.
In the Nether, walking 1 block's distance equals 8 blocks of Overworld distance. In fact, if a player travels to the Nether, walks 128 blocks and builds a new portal, they will exit 1024 blocks from their previous Overworld portal. Hmm... now take into account the fact that bedrock lines the bottom of the Overworld and top of the Nether. Then assume that the planet is round. If the Nether is in the core of the planet, and one sections the round planet off into pie wedges... then it'd be a far shorter distance to travel in the Nether, with the upward connections to the Overworld fanning out in that wedge shape.
Cave Spiders: Slightly smaller, far more dangerous versions of their surface cousins. In real life, the general rule of thumb for venomous insects is that smaller ones tend to be more poisonous then larger ones. Big insects have brute strength on their side, so the smaller ones have developed more powerful poison to even the odds...
Why the hell would Villagers trade Emeralds for Rotten Flesh when they're terrified of zombies and hate the things? Wouldn't they want to be as far away from that stuff as possible? Normally they trade for stuff they want to use, but in this case they're rewarding Steve? for killing zombies for them, and having the flesh is providing proof that he did it. So trading 30 pieces of the stuff is basically Twenty Bear Asses!
Why are creepers afraid of cats? There's the silly explanations (creepers are either made of catnip or afraid of being scratched since they're the same shape as a scratching post), but there's another, much more frightening one. You know how ghasts' sounds are actually slowed-down cats? And if the Nether is Hell, that might mean that ghasts are the souls of dead cats! So perhaps creepers aren't afraid of cats themselves, they're afraid of what cats have the potential to become ...
Why does the Wither actively try to kill creepers and ghasts despite not normally intending to harm plants and undead? The Wither, being an explosive boss mob, acts as a tyrant towards all other explosive mobs. Maybe that's why creepers and ghasts are sad all the time.
Sugar is used to make a Potion of Speed. Sugar rush anyone?
Gold carrots are used to make night vision potions, because apparently, carrots are good for your eyesight.
Why do zombie pigmen have parts of their skin missing? Because the Wither skeletons' withering effect makes them decay faster.
The Overworld is the only place where you can find water naturally, so it's the land of the water. The Nether is practically filled with lava, so it's the land of lava. When you combine water and lava, it creates obsidian, which is used to make Nether portals. Nether portals are the bridge between the land of water and the land of lava, so it's only natural that you need water and lava combined to make them.
When endermen look down on you with open mouths, you can see a face inside of them...
In the Adventure Update from 2011, zombies drop flesh, and you have a hunger meter. Cue the Cannibalism.
The single player game gets really scary when you realize that you are the only living human in a world where monsters creep wherever sun doesn't shine. Everything hinting to other people are zombies and skeletons...
The zombies look exactly like you (the default skin, anyway), except for the green skin.
Furthermore you can never die, endlessly respawning, doomed to live alone for all eternity.
If you set the perspective to third-person, you may notice a peculiarity in the Nether. Ghasts don't aim at the player character. They aim at the camera. In other words, they aren't trying to kill your character. They're trying to kill you. Better hope your Fourth Wall is sturdy enough.
To tame a wolf you need to give him bones. Obtained from skeletons. You feed your wolf human bones. Not only that, but your pet wolves will happily accept rotten flesh as food. Rotten human flesh from zombies. Actually a good use for it, since they won't get food poisoning from it. Unlike you.
If the room is too dark and you fall asleep, a monster will spawn by you. What if its escaping from your nightmares?
The 1.6 and 1.7 updates both end with "removed Herobrine" ... Why did he have to remove Herobrine twice?
What would a creeper look like in real life?
Endermen can teleport anywhere. We have yet to see the implications of this, but just imagine fighting a mob that you can't ever escape from. That's what we'll be doing by September of this year. Pleasant dreams.
Adding to the above: Endermen move blocks. You know what that means, right? They're still trying to build.
And they make strange... alien sounds when idle, but when staring at them the volume increases, as well as the tension, and they use nether portal sounds when teleporting.
Furthermore, what they can move includes pumpkins. Pumpkins, for those not in the know, allow you to look at an Enderman without it catching wise. So the implications of them being able to steal them from you... are not reassuring, to say the least.
Just think, you're exploring an abandoned mineshaft one day, and you haven't seen a cave spider once. Suddenly, you see cobble stacked up to the sealing at an intersection. Now, you think, I just discovered this mine, nobody could have put this here, so you break it down. Suddenly, you are jumped by Cave Spiders. What sealed them? Probably the same people who made this mine in the first place. Now think of where they are now....
If you've ever run headfirst into a Creeper, chances are you've probably asked yourself "what kind of demented creature would want to blow itself up to inflict damage to someone else?" Well, humans, for starters.
If you explore a cave with the sound on you hear eerie, demonic noises called Cave Noises or Ambience. They can be useful (they tell you when an unopened cave is nearby) but don't sound like any of the mobs or other sound affects, so... WHAT THE HELL IS MAKING THOSE NOISES?
When you're looting a Desert Temple, it's probably best not to think about why there's so much rotten flesh and so many bones mixed in amongst all the valuable posessions you're grabbing.
There are baby zombies. So either the undead are killing babies and inducting them into their hordes, or, the zombies are having sex. Neither explanation is particularly pleasant to think about.
Ever accidentally leave the door to your house/base open while going on a long mining expedition. Only to find monsters squatting inside when you return? Can't help but feel they were waiting for you to return. What other reason would a bunch of creepers have to sit inside a random otherwise empty house?
When fishing, you can get treasure or junk in addition to fish. How did they get there? Well, just like in desert temples and jungle temples, some of the junk you can get is bones and rotten flesh, dead remains. Someone was buried at sea with their junk and treasure, so you're grave robbing. Or, someone could have drowned, or been killed while swimming, or been killed while on a boat. So, whenever you're fishing and you get something like an awesome, enchanted, bow, that's stealing from the dead, without even knowing it.