Dead silence.
"I didn't mean too! It just happened!"
"You broke my piano! You fool!"
"Ow! Zat hurt. I vill buy you a new one! A more awesome one."
"I don't vant a new one. I vant you to get up, get out, and stay out!" Austria pulled Prussia up from the piano seat and threw him out into the hallway.
"I vill make it up to you. Do you vant to become a Margrave? I vill make you a Margrave!"
"I am already nobility. Go away!"
"But..." Prussia bit his lip.
"Go!"
He slumped over depressingly. "I'm really sorry."
Anyone else feel sorry for Gilbert? He was just trying to impress Roderich.
... But I can see Austria's side of it too.
'Margrave' is a noble class in Germany, like a Count or Duke. I didn't know that it was a noble title. I just thought it was a last name (I had a friend with the name Margrave), so I learned something today. And so did you, if you didn't know that.
As for the "I am already nobility" part, I have a headcanon that all the nations are a part of their nobility. I mean, it makes sense, doesn't it? And that would just be a nice thing, to have the countries have that bit of acknowledgement.
Sayonara.