Spinal Tap Returns
This is a 4 minute preview of a new 15 minute Spinal Tap short that's been produced to commemorate the band's reunion as part of a global warming concert on July 7th. The full video can allegedly be found here, but so far here I can't find the link.
Of course, this is not the first time Spinal Tap's reunited. I saw them a few years ago at a great concert at Carnegie Hall, where The Folksmen opened (and were loudly booed off the stage by a band that didn't get the joke!) a few years before A Mighty Wind. More famously, there's also this:
That's from a full length movie called The Return of Spinal Tap (also known as A Spinal Tap Reunion: A 25th Anniversary London Sell-Out), which was mostly a concert video from their "Break Like the Wind" tour. There's plenty more clips from that on YouTube as well if you're interested.