Boom De Yada is from a Discovery Channel commercial, which you can find here:
http://www.youtube.com/watch?v=at_f98qOGY0
The XKCD comic is a parody of this commercial. Pretty good. Now this is going to be stuck in my head for days. Now that I’ve watched the commercial, I can fully appreciate the genius behind the comic. This is already one of my favorites.
