Does this count?
/r/Perfectfit: Feels good, man. - We're a subreddit for things that, surprisingly and satisfyingly, fit perfectly into each other. And we'd love to have you join us! Originally inspired by http://thingsfittingperfectlyintothings.tumblr.com/ - September 25, 2019 - 19:07
This cat is the full package: its adorable AND fits into a bookshelf.
/r/aww: A subreddit for cute and cuddly pictures - Things that make you go AWW! Like puppies, bunnies, babies, and so on... A place for really cute pictures and videos! - July 27, 2019 - 22:58
Вписался
/r/Pikabu: Пикабу на Реддит - Welcome to the Russian side of Reddit, comrades. This is biggest Russian subreddit. We are not affiliated with the original Pikabu website. We luckily managed to escape their censorship. - July 27, 2019 - 12:41
HMC while i make this jump
/r/holdmycatnip: A Carnival of Catnip Chaos! - Catnip related catastrophes and other shenanigans is what HoldMyCatnip is all about. Post cats doing crazy things! Subscribe today! - July 27, 2019 - 11:14