Mystery Classical Song

I have a line from a classical composition in my head today. I have no idea what it is. Anyone have a guess? Apologies to all you music theory people out there, but it goes sort of like this:

DUN--dun--dun--dun (moderate tempo)
dun-dun-dun-dun-dun-dun-dun (really fast)

In terms of how the notes relate to each other, it's like this:

DUN
dun
dun
dun

dun
dun        dun
dun dun                           dun
dun

The person who guesses right on this hackneyed description gets special mention in the blog! Leave comments with your ideas and/or links to YouTube videos!