Minecraft (PC). Had the single absolute stupidest death in all the time I've had the game (since just before Alpha).
I find a stronghold by accident, so I do a whole pile of stuff to prepare for the dragon fight. All sorts of important things. I've got enchanted armor, enchanted bow, healing stuffs, and a variety of other things. Once ready, I head back to the portal room. I had left the silverfish spawner alone, figuring, if the devs give the things items that they drop later on, I'll have the spawner right there and wont have to spend a zillion years trying to find the things! But I wasnt entirely paying attention to them; one of them hopped in the portal. I finish off a stupid creeper that naturally just HAD to make an entrance, and then it's time to head to the End. Jump in the portal, the End is formed, and my stupid obsidian platform just HAPPENS to have spawned out over the void instead of on the island. Spawned with me and that ONE silverfish. One. Damn. Silverfish. It hits me ONCE, about 2 seconds after I'd spawned in the End. Just ONE hit, and BAM, it's over, down I go, and of course a death in the void means you lose EVERYTHING you were carrying.
Because of that ONE stupid little twerp, which is the monster type with the absolute weakest attack in the game (it's meant to attack in hordes) and low health. Just.... one. And I've got all that armor and stuff and it just didnt matter...
Uuuuugh.
I did go back there and do the damn dragon fight, with new equipment and such, nearly died like 3 times during THAT, I'd forgotten that the horrid thing hits like a freight train and the Endermen, they are everywhere and it's very hard to NOT manage to catch one of them (or five of them) in the crosshairs, making them go berserk, and ugh. Barely finished the damn thing after about a billion years. The blasted crystals, a couple of them had spawned on the tallest towers in the history of... towers.
Just... argh. Most idiotic death in that game yet. Die because of a single hit from the weakest thing! I doubt I can top that one. And of course that's just the dragon, the Wither and the Elder Guardians havent been fought at all yet (they at least can be done more than just once). Aint doing those yet. Need waaaayyyyyy better equipment before I attempt those.