Apropos of nothing, ballroom dancing to Nirvana

Ok, so I am innocently sitting cataloguing books this evening with MPBN's, America’s Ballroom Challenge, on in the background being ignored. Strangely, I heard the beginning of Nirvana's, Smell's Like Teen Spirit and looked up...not unreasonably surprised. The couple, sadly I have no idea who they were, proceeded to do what I can only describe as the "coolest" ballroom routine I have ever seen on a ballroom floor (admittedly, I don't follow it at all). It was wonderfully creative and just a riot to watch. If it appears, I'll post the YouTube. I'm very disappointed I didn't capture it.