, Craig_Matthews wrote

As for DVDs - I use a DVD player. But seriously, people watch DVDs on airplanes, in waiting rooms, and even at their desk at work on their notebook.  

I don't know of anyone who watches DVDs from spinning media when they're on battery - most laptop batteries can't make two hours if they have to be constantly spinning.   Whenever I've seen people watching movies on their laptops, it's typically from ripped videos.