My Little Pony: Friendship is Magic, Season 2

Rarity:
Very well then, what shall we write to the Princess?

Sweetie Belle:
I'll start. "Having a sister is just about the bestest thing in the world. But it sure isn't the easiest."

Rarity:
I agree that being sisters is a wonderful thing, but it takes teamwork. Sometimes it's about compromising. Sometimes it's about accepting each others' differences. But mostly, it's about having fun together. Even if it means getting your hooves a little bit dirty.

Sweetie Belle:
A lot dirty.

Rarity:
A little bit dirty.

Sweetie Belle:
A lot dirty!

Rarity:
A little bit dirty!

Sweetie Belle:
A lo --

Spike:
Hold it, hold it! How about: a medium amount of dirty, not too little, not too much, just right?

Rarity, Sweetie Belle:
Deal!