Fuck You, Warner Brothers

And then if you go to college, there aren't quite so many people making things fun for you--although there are RAs, and the student life office, and various clubs and organizations doing activities, etc.--but you're in an environment where your friends are nearby and you all have similar schedules and responsibilities, so a lot fun just kind of arises spontaneously.

But once you're out on your own, in the workforce and whatnot, all that just drops of a cliff. Planned activities for adults exist, but you generally have to seek them out, rather than having them relentlessly advertised to you and/or taking place in locations where you will bump into them on the way to breakfast. And your friends are all spread out, and everyone's busy at different times, so you aren't just bumping into people and getting sucked into whatever adventure they have going on, you have to make arrangements.

It's a big shift! If you have kids, you generally figure out pretty quick that your role is now the Planner Of Fun, but without that big obvious signpost, it can feel like the world just gradually stopped having fun things in it.

But it hasn't; you just have to plan and seek out opportunities for fun yourself, because it's no longer anyone else's job to put them in front of you--it's yours!

Not a biologist, but the evolution of mammals is way more granular than you might expect. Humans are the sole surviving species of the genus Homo, which was a real party before the other ones went extinct. You're in for a fun time.

Domestic cats are believed to be domesticated not from tigers, but from the African wildcat:

Which evolved to be small just because it's sometimes more useful to be small.

And no, hamsters are not off-brand rats. They're part of the rodent order, which includes beavers, moles, capybaras, guinea pigs (yes, also wild) and lots of other fun things: