A/N: Based on my sudden obsession with centaur!AUs… And my boredom in church. It's short, pointless, and could be classified as crack, depending how you look at it…
Karkat pinned his ears back slightly and crossed his arms with a huff. "You are the stubbornest of mules, John Egbert. You are so fucking stubborn, you make other mules seem like the most pliable creatures in the entire goddamned universe!" he exclaimed. John just laughed at him.
"Haha, if we're going there, then you're the biggest ass I know!" he responded cheerfully.
Karkat threw his hands up in exasperation. "Why do I even bother?" he muttered. "And, for your information, Strider's a bigger ass than I am, and we all know it."
A/N: Short, stupid, and probably not as funny as I think it is, but… Hey, first Homestuck thing!
Yes, John is a mule, and Karkat's a donkey (Dave isn't, though).