Drum & bass ditty by Squarepusher featuring some crazy samples and, well, drums and bass.
The video was produced by Chris Cunningham and is more like a short film than a music video, with a plot describing a little girl's escape from some kind of secret laboratory guarded by gun-toting brutes dressed in white (in accordance with the sterile atmosphere of the video).

Oh, might as well include the lyrics:

Let the bass kick!
I'm the fucking daddy!