OS X running on a Microsoft-branded tablet? Say it isn't so!
Apple's operating system in running inside a VM--virtual machine--on the Windows 8-powered tablet, so there's no doubt a performance hit to doing this, but still, it's a pretty impressive.
According to Donald Annis who uploaded the video, the Wi-Fi driver doesn't work, but everything else seems to be OK.
Some might claim that this is a hoax, but I've seen OS X run on many different PCs, and given that the Surface Pro is nothing more than a thin PC, this doesn't seem all that far-fetched to me.