I saw this guy's show in Reno and he went to great pains the whole time to show people he didn't have an 'ear-piece'. He did some pretty freaky things like reciting word for word parts from the dictionary (it reminded me of a part from the mothman prophecies with Richard Gere). I hate to be a spoiler but this is just killing me and I'd love to know how it works:
http://www.youtube.com/watch?v=QCXuy6d2rWs
Anybody know?