This is John getting down on a jam of "Slow Dancing in a Burning Room" off his newest album Continuum.... Half way through it he grabs the fans camera and uses it to play the solo.... It looks like he's only picking with the camera... I've seen vids of him playing slide with fan's cameras before... I just thought this one was cool since the camera was on at the time:
http://vids.myspace.com/index.cfm?fuseaction=vids.individual&videoid=1384629462