This idea came to me when I was watching "It Ain't Easy Being Breezies", and Fluttershy just starts talking in Breezie like it was nothing for her, and remarks that she speaks many different animal languages. (She really is the best pony.) So I wondered, can any pony compete with her? What languages do the other ponies know? Originally I was going to have this be a "Who's the best pony?" kind of thing, but decided to just turn it into a less contentious Q&A interview, instead.
Edit: 2015-02-28 - Changed what Twilight says so it's less confusing.