This is only because I was at the motion pictures on Saturday being the last person in London to watch Anvil on the big screen (***1/2) - how did popcorn become associated almost exclusively with movies? There are many other snacks that could do the job. But also, for a snack that so many people actually enjoy, you almost never see it outside cinemas or watching a DVD (ie. film) at home. I can't think of any other foods that have such a narrow remit.