A while back I instituted a personal rule that I am not allowed to use my phone or laptop while watching TV or a movie. My rationale is that if I am uninterested enough in the show to need additional distraction, the show is not a good use of my time and I should just turn it off. It was really hard to get out of the habit, but it's worked pretty well for me. I find that I understand and enjoy the shows I'm watching more, and I also watch less TV because I more consciously notice when I'm getting bored, and I go do something else.