When my sisters and I were much younger, we fought and clawed and scratched (as siblings often do). One of the recurrent themes in our shouting matches was what I now think of as the escalating swine shouting match. Two out of the three of us would be arguing, and eventually all of our arguments over Barbies or spilled juice or who gets to hold the clicker would degenerate into name calling.

Give it back!
No, I had it first!
It's not yours!
It's not yours either, stupid!
You're stupid!
I know you are, but what am I?!
PIG!
HOG! (oinking noises usually accompanied this)
WILD BOAR!!!

Wild boar was generally the end of intelligible speech, from there on out, it was pretty much just garbled yelling and punching noises, until somebody stormed off or started to cry.