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I just discovered a lush underground garden in the dirt room of an abandoned mineshaft.

I know that flowers and grass occasionally generate in caves and mineshafts but I've never seen anywhere near this many.

(Seed: "-1558724444436115790", coordinates 106/28/-15, version 1.14.4)

Practically under spawn (about 28 blocks away horizontally.)

I've seen plenty of spider jockeys

Baby zombie riding a chicken

Had skeletons drop punch 1 power 1 bows

found notch apples in mineshaft chests

1 emerald mending books

Quote from TheMasterCaver»

The reason why worlds are sometimes not fully deleted is because the game runs an internal server on a separate thread and the client doesn't check to see if it is still running (or wait until it shuts down) before it lets you try to delete the world, resulting in a failure to delete files that are still in use, and/or the internal server creates new region files with chunks that were modified since the last save (hence why there are often a lot of random chunks left; failure to delete a whole region is more likely to leave a solid area of chunks behind):

MC-315 Chunks do not delete properly remaining in a newly created world if the same world name is reused

(note that the server thread is saving chunks at the same time the client thread is trying to delete the world. This won't always cause errors to be reported, like in the case the client already deleted a region file before the server saves its chunks, creating a new file)

The same mechanism also explains many other oddities/world corruption, and is somehow still not fixed despite being so simple; I fixed it in the first version of TMCW - released more than 5 years ago - and the fix itself was actually taken from Forge 1.6.2 - with this fix it is impossible to replicate any sort of saving/deletion bugs, short of an actual crash):

Vanilla:

if (this.theIntegratedServer != null)
{
    this.theIntegratedServer.initiateShutdown();
}

this.theIntegratedServer = null;

TMCW (this forces the client ahead to wait for the server thread to terminate; this also prevents the client thread from setting the server object to null mid-save, causing world corruption. This does have the (small) disadvantage in that if the server locks up (such as after certain crashes) you have to force-quit the game as it will hang on the shutdown screen indefinitely; on the other hand, without this fix I've had such cases leave a Java process running without any visible window):

if (this.theIntegratedServer != null)
{
    this.theIntegratedServer.initiateShutdown();

    if (this.loadingScreen != null)
    {
        this.loadingScreen.resetProgresAndWorkingMessage("Shutting down internal server...");
    }

    while (!this.theIntegratedServer.isServerStopped())
    {
        try
        {
            Thread.sleep(10);
        }
        catch (InterruptedException ie) {}
    }
}

this.theIntegratedServer = null;

Otherwise, the game won't be able to see a world if level.dat becomes corrupted and it will simply reuse any files with the same names (a simple way to recover a corrupted world is to create a new world with the same name, and ideally, seed; due to level.dat storing special information about the world in newer versions, such as the locations of End gateways and the status of the dragon fight, you should try to rename level.dat_old (a backup from the last save) to level.dat first). This also presents a risk that you could overwrite non-Minecraft files, although that is rather unlikely (you'd need a folder with the same name as the world containing files with the same names as Minecraft data files).

But wasn't that internal server thing only implemented somewhere late in the full release?

Don't know how rare this is, but I came across a skeleton horse (which spawned 3 more skeleton horses) today

Quote from ZaffreAqua»

Some time ago I came across a zombie with a piece of diamond armor. I believe this is my second encounter with one in all of my years of play, though I am not sure. For a long while I thought that mobs spawning with diamond armor was a hoax.

I have had a handful of full diamond armor zombies show up in my giant grinder on a server before. That was within the past 3 years, though. I haven't seen them anywhere outside of the grinder.

I happened to see a diamond armored zombie the last time I played, one of 5 that I've seen in my current world (I did modify inhabited time so it starts at 50% of its maximum so it is at a decent level by the time I explore an area, but I did not increase the chances of armor/better armor, as I did in later versions of TMCW, where they are a weekly sighting for somebody with my playstyle, where I've killed as many as nearly a thousand mobs in a single play session while caving. Note that 1.6.4 handles regional difficulty differently as well - you can even see armored mobs in a brand-new world since the probability starts increasing from the moment a chunk is loaded, while since 1.8 the "raw" value must be at least 2 to have any effect):

These are the other diamond armored mobs that I've seen in the same world (all zombies):

This may have been the first diamond armored mob that I saw in this world, which I'd previously played on years ago but I don't have any record of having seen any; it also dropped its helmet:

Next I saw a zombie villager in full diamond armor, which dropped its chestplate:

The third and fourth zombies also had full diamond armor (no drops):

The exact probability of seeing a zombie or skeleton with diamond armor is one in 2333 armored mobs, and one in 15551 of all mobs at maximum regional difficulty (15% chance of armor); for comparison, I've killed an average of about 430 mobs per play session over the past month, about half of which are zombies (probably less in newer versions since Mojang nerfed their tracking range in 1.8; in 1.6.4 it isn't even dependent on (regional) difficulty).

Also, a while ago a zombie dropped a shovel with Efficiency III, Unbreaking III, Silk Touch, one of the most highly enchanted items that I've gotten as a mob drop:

I also found a double emerald vein, one of only a few such occurrences that I've seen out of thousands of emerald ore mined across my worlds:

Also, this is the largest single deposit of diamond that I've found, with a total of 12 ore from 2 adjacent veins:

Another unusual thing I found in my current world is a stronghold library with a lava lake (this is no longer possible in newer versions of TMCW as I prevent them from generating around any structrues except mineshafts; notably, prior to 1.13 vanilla did the same for lakes in villages):

The stronghold also happened to be in the rarest land-based biome in TMCW (excluding Mushroom Islands in oceans), Volcanic Wasteland (this in part explains the lava lake as they are much more common), which aren't actually that rare when compared to the rarer biomes in 1.7+, but still less than 1% of land area:

Of course, nothing beats a charged creeper in terms of overall rarity - just one in over 6 1/2 years of playing (everything shown here is from the same world, which has about 38 days of playtime):

I built some traps in front of my base right underneath spawn on a deathban server a couple years back. Someone fell for both traps, and then returned and TNT'd my base as revenge.

Just a couple weeks ago, someone on an anarchy server was talking about dying to some traps on a deathban server and perfectly described my base. He was the guy. What are the chances?

Ive seen a zombie spawn in the nether.

I seen blocks with gravity sitting in the air

ive seen a missing chunk that was pretty cool.

when i was playing in Minecraft Beta 1.7.3 a pig spawned righ next to me randomly walked into my cactus farm and died.

no joke