Well personally, I switch the lower EICAS or sometimes the Nav Display, to Channel 8 to watch a film, not forgetting to lower the volume of the nav radios, cos otherwise I find it difficult to concentrate on the dialogue in the film.
I don't let my co-pilot watch the same film of course, cos that would be silly, and of course if I use my nav display to watch the film, I make sure he uses his Primary Flight Display; to do otherwise would be stupid and result in poor flight path monitoring.
It does get boring however towards the end of some months when I find I've already watched all the films available, on those occasions I either go to First Class and sit down and watch a different film that they have on there or just put the seat back and get some kip and let my co-pilot watch the films ( I think that is what he does, but I have a suspicion that he also gets some sleep - it's difficult staying awake all night by yourself).
Toodle pip.