Well for me it was one late night I ran out of my base to check out if any mobs were there and sure enough 3 creepers were headed my way. I hoped they wouldn't bomb my base but they did. Two of the creeper worked on breaking the front gate then the last one went to kill me. 3 hearts left I began to run from the creepers and I hit a from behind while facing another creeper.
I've been creeped out, unsettled and startled many times. But at one point, something actually made me exclaim "Oh god!" in the middle of the night. Stereotypically enough, it was a creeper... But the most skilled creeper I've personally encountered.
I was in the middle of building my church, finishing up the tower. After spending two Minecraft days straight up there, I waited until I ran out of stone and the sun was high in the sky. No sign of danger below, so I merrily climbed down the stairs, opened the front doors, and when I turned around to close the doors, right there, an inch from my face
I twitched, smacked it once with my sword, then it blew up the entire front wall. I survived, luckily, and I had enough smooth stone to repair the damage pretty quickly, but... Damn, that creeper was just sitting there, JUST out of view, waiting for me to turn around to face it... Just imagine, if I'd gone through the right door instead of the left, I would've turned the other way and wouldn't have noticed it. I probably would've walked away oblivious and unharmed. But oh no, it had to be on the LEFT side...
I don't have many scary moments because I play on peaceful. But it was when it was night. I got lost. Everything was dark. Then I finally found the way to my base and thought that everything was over now. No more scary darkness. I found that I had left a part of my base - the "Admiring platform" unsealed from the top. I got the glass out of the furnace and went to seal it up. Just then a red THING appeared in front of me. I friggin' shivered a few minutes after that. It was a cow that fell there and got hurt. Man I suck!
I was trying to make the mob spawner in a dungeon into a monster harvesting trap, on peaceful. I went to go hide near the bottom of the trap, turned it to hard mode. Nothing was hapening, so I destroyed a block to get a better view, then a spider fell out of the sky, right past me, and hit me on the way down. It was sudden and I jumped.
Today i Generated a new map and settled next to a waterfall so i went out to find a cave to get some ores 5 miniutes of exploring i discovered a small cave with a dungeon on the surface so i went in killed 1 zombie and lighted up the place after taking the loot i thought about why waste wood building chests so i broke a chest then suddenly after i brake it a zombie pops out of it i jump out my chair like AGUUGUGUAUAUAAAHHH and start stabbing randomly with my 1 heart of health and run screaming back to my Mine
i was just spelunking in a big cave on peaceful, i was walking through a dark tunnel and about to place a torch, when i suddenly fell down a small hole in the floor.
i looked down and saw a GIANT pool of lava beneath me. i expected to burn to death soon and close my eyes.
however, when i opened my eyes i saw i landed on a single block of gravel sticking out of the lava.
it was the only piece of land anywhere around except for a wall nearby.
i got out alive but that scared me alot!
well, i was walking through a tunnel-cave, when i noticed a hole in the floor leading to some mobs in a small room.
i thought, "oh, ill just drop in, kill em and come back up"
it was actually a HUGE TUNNEL FULL OF MOBS, AT LEAST 20. i actually screamed.
(of course, this was when your save was ruined when you died)