If you've spent enough time on the internet, you've probably encountered one of humanity's greatest scientific discoveries: cats are liquid. Not metaphorically. Not spiritually. Apparently physically.

At least that's the conclusion thousands of people have reached after witnessing cats squeeze themselves into containers that seem several sizes too small, spill over furniture like melted ice cream or somehow flatten themselves into shapes that should require the complete removal of several internal organs.

This bizarre observation has become so popular that it spawned an entire online community dedicated to documenting the phenomenon. The subreddit "Cats Are Liquid" is filled with photographic evidence showing cats behaving less like animals and more like some strange, furry substance that flows wherever it pleases.

And somehow, the smaller the container, the more determined the cat becomes.

Scientists can explain flexibility. Veterinarians can explain anatomy. But neither fully explains why a cat will look at a container clearly designed for fruit and decide that's where it belongs now.

The internet, naturally, has embraced the liquid cat theory instead.

This collection features 20 cats that appear to have abandoned the traditional rules of solid matter altogether. Some look like they've melted. Some resemble spilled water with ears.

Whether they're overflowing from tiny boxes, pooling inside household objects, or transforming into shapes that shouldn't exist, they all support one increasingly difficult fact to ignore.

Cats may not actually be liquid. But after seeing these photos, you're going to have a hard time proving otherwise.

Here are 20 cats that provide compelling evidence that the laws of physics are merely suggestions.