Why, yes, this is a parody. And I do not own Avatar. Warning for... aw, I wouldn't want to spoil it. :-D
Once upon a time, Aang saw Katara beating up rocks with her water skin. So Aang went up to Katara and said, "MOO!"
And Katara said, "Aang, are you okay? You're acting like a cow."
"I'm just trying to be just like you so we can get married!"
"I'm not going to marry you, and I'm not a cow!"
And she kicked Aang in the balls, laughed maniacally, and skipped back through a field of lilies to camp while Aang cried on the ground.
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And then Toph came up out of the ground. She poked Aang in the head, laughed maniacally, and went back underground.
And then Sokka came up and laughed maniacally, whacked Aang's head off with his boomerang, laughed maniacally again, and went off towards the river and drowned himself.
THE END :-D
Warning for character death and minor OOCness.