T-Rex: Babies learn a lot of stuff pretty quickly! They're just going through life, minding their own business, when suddenly it's like...

T-Rex: "Wait... THINGS STILL EXIST EVEN WHEN I'M NOT LOOKING AT THEM??"

T-Rex: And bam: object permanence. And as adults we think "Pfft, I walk around all day knowing that things exist even when I don't look at them and it's no big deal for me", but that's only because we've forgotten - BLISSFULLY FORGOTTEN - the dizzying, terrifying implications we were forced to grapple with when we first discovered object permanence!!

Utahraptor: It doesn't sound like that hard a concept.
T-Rex: But the implications! THE IMPLICATIONS.

T-Rex: If objects exist when you're not looking at them, then the entire universe has a life outside of you. And in that instant, alone, prelinguistic, each child becomes their own Galileo, concluding that despite all emotional evidence to the contrary, they're NOT at the center of the universe.

T-Rex: Plus this all happens around 12 months of age! Imagine on the day you discover you're NOT the most important thing in the universe, you're also pooping your pants and crawling around in a dirty diaper for at least a little while!
T-Rex: AND WE WONDER WHY BABIES CRY "FOR NO REASON"