Forgot to hold shift while near a ravine with a lava pool. I fell with my inventory containing almost a full stack of iron ore and couple pieces of gold ore. I jump in it for fun when im bored and to lazy to do anything.
While having the 3 most imporant rules up i dig striaght down into lava and in my panic I attempt to throw gravel on my face only to push myself father in lava but not to die from that but from suffocation.
It was my first night ever and I was expanding out my shelter I dug in the side of a hill. It was 3 blocks high and I ran into a cave where I saw my first mob ever (An enderman) and I didn't know what enderman do so I looked at it and It teleported into my shelter and killed me
Well the first thing that I did was I make a giant house out of dirt with no light getting in so I could survive the night not knowing mobs can spawn any where it is dark enough. A skeleton poped in my house and well ya...
Another is I used to play Minecraft in the early Beta and I think you could mine obsidian with iron so when I updated I spend a VERY long time mining that with my iron pick to find out that it drooped nothing, so I deleted all of my .minecraft and tried again thinking that it was corrupt. I did this maby 5 times before I looked at the change log.
Another would be making flint and steel in the early to mid beta. Not knowing that it worked like a lighter I started to right click on trees. Fire used to spread indefinitely so.... bye bye forest tree house!
When I spawned in my first world I was at the edge of a really nice village. I was surprised to see people because I thought I was supposed to be the only person there! hahaha I wanted to look around at the houses and such but the villagers kept coming up really close to me and staring, and I worried they might attack me for trespassing. So I moved on and eventually found a nice place to build my first home away from those creepy villagers. After about a week of playing I had a really nice place (to my noob eyes) with wheat farms, cows, pigs, and chickens. I had iron armor, several stacks of iron for tools and new armor, and had just tamed a kitty. Life was good.
Then I found out you can lose your world if you don't have a backup save. I didn't know you had to make backup copies! I didn't even know what the seed was so I couldn't recreate it. My new world has a backup save. Several of them, just in case anything goes wrong.
I wish I had known about chests in villages and how it would have been a great and safe starting point. And I wish I had known about the need to save backup copies of your world. So there are my two noobiest moments, tied for first place in my doh! moments list. Thinking villagers might attack me, and not knowing to do a save.
I remeber back around Alpha 1.1 or something like that. (LONG Before Nether) I First played the game after my friend gave me a cracked download (I bought it now... I bought it a month after I cracked it.) He told me on the phone to punch trees, I sat there like "ITS NOT BREAKING GODDANGIT" and it took about 30 minutes until he realized my problem. I was punching the tree click by click. Not continuously... I was sooo nooby.