So, you and hundreds of thousands of others picked up your Blu-ray copy of The Dark Knight today, huh? We know you haven't had time to fiddle with the BD-Live extras just yet, but one Joe Lynch from G4 TV has. One of the most intriguing aspects of the flick's interactive feature set is the fan commentary; put simply, users hook up a USB webcam to their player (PS3 included) and then commentate as the film progresses. From there, you can upload your take(s) to the BD-Live servers for others to enjoy. Granted, we aren't too sure how you'll actually find someone bored enough to listen to you jabber on about a film they purchased, but we reckon that's beside the point. Vid's waiting after the break.