wisest is she who knows she does not know

Things Rocky does when he got back from Adrien that weirds out other Eridians:

He (subconsciously) picked a facet of his body as his "face" and turns it sometimes to orient towards people or objects he's paying a lot of attention to or concentrating on. 

That thing I've seen Chinese people on social media discuss where they use their own characters to reproduce an English word phonetically, with the actual meaning being a fun sidepoint. Rocky reproducing his closest approximation of words without existing Eridian equivalents (relativity, caffeine, all the colours) that sound like gibberish or odd mashes of existing Eridian terms. 

Thumbs up (down)

Making "random" components of structures transparent for no apparent reason (Grace can't be here, Grace will never be in this part of Erid, but if he were, he'd be able to see)

The Eridian word for "See" is probably something to do with detecting light. Rocky would use this odd, scientific phrase the way a human uses "Oh, I see!" to mean "Oh, I understand." Like someone saying "I've used a Geiger counter to verify the radioactivity of this abstract concept" when they mean, "I get it."

You need to be Silent when watching someone sleep because you could wake them up. A completely incomprehensible idea to Eridians.

You discovered it, you get to name it! No, actually you're Not allowed to call the new molecule "Low Friction, high thermal stability two-parts-carbon-to-four-parts-fluorine" try naming it after your pebble!

1, 2, 3, eyes on me! (Eyes being another phonetically assimilated word)

All through the night, men looked at the sky and were saddened by the stars.

—Quote from Catch-22

Textless version below cut:

The world is oftentimes such an ugly place, but sometimes it can be so beautiful.

Like, when two choirs, one from Croatia and the other from Zimbabwe, met on the opposite sides of a Lisbon subway station and both sang to each other.

I unfortunately do not know what the Zimbabwe children choir sang to them (although it was so beautiful), but the Croatian klapa Kastav sang 'Kuća puna naroda' (a house full of people).

And let my reward be a house full of people, my life, give me a voice, so I can embrace you with songs.

Rocky's view of the world

Part of socializing and having friends is being a good listener even when you don't actually give a shit about the subject.

Your are hurting other people's feelings when you bluntly respond with "Anyway..." and then change the topic.

It can not always be about your preferred topic.

"You'll find a solution."