I’d say the silliness seen here goes hand-in-hand with curiosity and intelligence, which makes them clever and effective hunters. This type of derpiness also earns them a rent free spot in monkey houses. So, dumb as it may seem, this is actually a very fit behavior.

The temperature in your house is too high … because your cat has taken to its liquid form.

It’s called “de-escatlation”. Just like de-escalation, but with an awkward hiccup.

Felis Slinkere!

i think stairs can just be awkward for cats to navigate too. they are designed for human feet…

… Drunken Tiger Paw?

Evolutionary advantage…?

Uh… its fairly energy conserving, accomplishes the desired goal when time is not a critical factor, also keeps kitty limber via basically a light stretch/workout of many diffent muscle/tendon groups?

not everything is an Darwinian adaptation.

Tbh, the most compelling idea of why animals play that ive heard is just as a way to keep the body limber and ready. Its like free form yoga and calisthenics combined if youre playing hard

“On the rheology of cats” is the article that studies this phenomenon, please if you don’t trust my link don’t follow it just search the name in quotes from the beginning of the message (you should never trust the links (-________________-) ) https://www.drgoulu.com/wp-content/uploads/2017/09/Rheology-of-cats.pdf

What is the evolutionary advantage?

Preservation of energy. Anti-parasite behavior.

Well, cats are basically liquids, so flowing down the stairs is actually the expected behavior.

Your premise is mistaken. The cat is rubbing its scent glands/scratching its cheek (and shoulder) on the stairs’ edges, to satisfy an itch and mark its property simultaneously. Sliding down the stairs is merely a benign side effect.