This one I just remember reading about some months back, so I won't swear that I've got it right. But I'm fairly sure I read if you're watching a movie on some of the newer mobile gadgets, and you look away, they are designed to pause until you look at the screen again. I may just be skeptical, but I would make a small bet that the feature would be so touchy/fussy and unreliable as to be mostly a
nuisance.