Oliver Stone asks moviegoers to power down phones—and leave them off

Ars Technica: We're all used to warnings and promos ahead of films, from candy-filled "let's all go to the lobby" sequences to a polite-yet-firm reminder to power phones off. Sometimes, those sequences get a cute touch-up (my favorite is probably this wild, vulgar parody from the Aqua Teen Hunger Force film), but starting this week, moviegoers can expect something a little darker—as in, a harrowing warning that sounds like it might have been written by Edward Snowden.