It’s from a game called Dwarf Fortress - where you play in a simulated world trying to keep your dwarves alive.

They get bored of eating the same food, so with farming and hunting there’s also fishing.

In the past, carps were added with some default settings, which made them overpowered. They would wipe entire squads of Dwarves that would approach any body of water with a carp in them.

(They were nerfed later on.)

The game has a very complex fighting system, so when creatures fight, sometimes they fall down, after a big hit with a hammer, or getting knocked unconscious. If they are not fatally wounded, they will get back up. There’s a lot of actions that happen inside the game, but not always in the ‘correct’ context, as the game is still in development.

And somewhere on the internet, there was a screenshot with combat log showing:

The Carp attacks the Miner but She jumps away! The Carp stands up.

So carps were already a challenge, and then you read they can stand up!? Imagine the terror of an army of strong beasts marching down to your fort from a nearby river.

There were many bugs in the game, if you like rabbitholes, this is a good one.

It does not have nerves, yet it feels pain. It does not have a mouth, yet it must scream. And until recently: death only made it so so much stronger!