Anon's headcanon tells Anon that Austria laughs like Tom Hulce's portrayal of Mozart in Amadeus:

http://www.youtube.com/watch?v=rjmmjXGwarU

SO: Anything with this. Whether Austria's being teased, or someone actually gets off to his laugh, or what have you.

Any of the European countries are welcome, with Hungary, Prussia, Germany and France being my personal favorites.