I'm actually embarrassed because I've heard this so many times and never bothered to find out its name. I asked my music friends and they don't know what it's called either.
It begins with DUN dun, dun dun, dun dun. And it's not Beethoven's 5th Symphony. There are a bunch of fast notes played by violins after the dun dun's.
The song is in this video when the timer says 9:00.
http://www.6nema.com/butterprod/court-m ... _lune-2465