Started about 15 minutes after scheduled time, interacted with the audience (including responses to tweets from the audience) discussed events in the area as he was coming to the venue, an aside about his iPhone and airline mode then began a story.
He is a good storyteller and my 17 year old son was enraptured for the whole time, but the audience was somewhat quiet and minimally responsive. That surprised me since the hallway chatter was enthusiastic and they were clearly fans. A good story with several lines clearly designed for audience response that just did not resonate with this audience.