Video footage has emerged that shows a group of canoeists struggling to paddle their small boats along because they were surrounded by a vast writhing mass of jellyfish floating just below the surface of the sea.
Imagine throwing a load of giant living Orbeez into a swimming pool and trying to get around on top of it using a paddle - it's sort of like that, but a heck of a lot more gross.
Anyway, this bizarre incident took place in the Sea of Azov, which - in case you're not familiar - is off the coast of Berdyansk in south-eastern Ukraine.
The footage was then taken and placed onto YouTube where it has now been viewed more than 110,000 times.
According to local media outlet Lenta, it is not unusual to see jellyfish in the area, but it is very unusual to see them in these numbers.
That could be said about pretty much any possible area of the sea that you could choose, you'd have to imagine.
As you can see from the video, the sea is actually so brimming with jellyfish that the paddlers are struggling to get through the water at all.
To be fair, they were probably being careful not to fall in, as well. That would be seriously disgusting, and - if they're that sort of jellyfish - sting quite a bit.
In the footage, one person can be heard to say: "It is like Jellyfish Island. Wow, looks like kissel."
Kissel - again, if you're not already familiar - is a viscous fruit dish, kind of like jelly, that is made with berries.
Even though there have been reports of thousands of jellyfish washing up on beaches in the area of late, these ones were very much still alive and kicking - or whatever they do instead of kicking.
This whole bizarre incident could potentially have been caused by the fact that the sea is getting saltier.
That's the opinion of Konstantin Demyanenko, the Deputy Director of the Research Institute of Fisheries and Marine Ecology, anyway.
He said: "In the Sea of Azov, this figure is now 14 ppm (parts per million), which is one-and-a-half times higher than in the 1990s, and also, climate change causes an effect."
He also mentioned that there are storms predicted, which can cause jellyfish to drift closer in to shore.
These cuddly little critters are known as moon jellyfish or - more boringly - common jellyfish. They're a prevalent species that is often found in estuaries and harbours.
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