On a slight variation...
I was on a flight a couple of years ago when during the entire approach, landing and most of the taxi onto stand, the video was still playing the Vicar of Dibley! As a result many pax still sitting with headphones on and eyes on the screens. I imagine in the event of a problem the PA would over-ride the TV audio feed, but it still wouldn't make for the most alert of passenger load if something like an evacuation became necessary.
I'd seen that episode anyway. <img src="rolleyes.gif" border="0">