I was just having dinner with friends, we were talking about what incredible athletes dancers are, and I was telling them about this video. Actually I suppose it is a video composite of high speed photography at 1,000 frames per second. The high definition version is better, but I can't find it on the Apple/MacPro site. You can read more about it here.
Ah, found it. Here is the high-res version from the MacPro site, without the bizarre but cool audio of the YouTube version.