I'm looking for an opera song (I believe italian) that has two long words beginning with "F" What song is it?

I think it's an Italian opera song? I hear it around Christmas time mostly but have heard it year round before. The title, or at least the two words they say the most begin with "f"

Funiculi, Funicula is Italian, and it's popular by Mario Lanuza
http://www.youtube.com/watch?v=MJd-SHzqUC4

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