Brad Carter has Parkinson's Disease. Brad Carter likes to play guitar. The former makes the latter, among other things, pretty difficult. So Brad had surgery and got a pacemaker implanted in his head to alleviate his tremors and treat his condition.
Brad was under general anesthesia for part of the operation, but to ensure that the pacemaker was placed properly the surgeons needed him conscious and responsive. So they woke him up, and had him perform some tests to make sure everything was working okay. He talked. He moved his arms. He even picked up his guitar and played a tune while people poked around the inside of his head.
The surgical team at UCLA was smart enough (they are brain surgeons, after all) to record all this and show it to the world. [Daily Mail]