Steven Universe, Season 1

Amethyst:
[pelted with water balloons] Ahh... It feels good to lose.

Pearl:
[clears throat] I certainly hope that's not the attitude you have during battle.

Amethyst:
Ugh, you're no fun anymore. This is why we never form Opal.

Pearl:
We don't form Opal because you're difficult and a mess!

Amethyst:
We don't form Opal because you're uptight and—

Steven:
[jumps in between them] Guys! Guys!! What is Opal?

Amethyst:
Oh, it's the two of us, mashed together.

Pearl:
[scoffs] Is water just hydrogen and oxygen "mashed" together?

Amethyst/Steven:
Uhh...

Pearl:
Analogy wasted. Look here, Steven. [manipulates the sand to demonstrate] When we synchronize our forms, we can combine into a powerful fusion gem named Opal.

Amethyst:
[stomps it] Except I don't dance like that.

Pearl:
Amethyst..!

Steven:
Wow! That's so cool! But tell me more about Opal!

Amethyst:
Well, Steven, she's an ultra-powerful, stone-cold Betty. That's part's me. And she's like, kinda tall—that part's Pearl.

Pearl:
What Amethyst is attempting to say is, Opal is an amalgam of our magical and physical attributes fused into a single entity.

Steven:
Wow, can you do it right now?! Come on, form Opal!! [Amethyst scoffs]

Pearl:
We only form Opal when it's absolutely necessary.