From Wired News: Cell-Phone Shushing Gets Creative:
It’s a familiar issue: You’re stuck somewhere with a nearby stranger yapping on a cell phone, but you’re unwilling to say anything about it. In December, designers Jim Coudal of Chicago’s Coudal Partners and Aaron Draplin of Portland, Oregon-based Draplindustries Design drafted a solution that’s been gaining buzz across the blogosphere.Following an idea initiated by Coudal’s wife, Heidi, Coudal and Draplin put together a series of free, downloadable cards, with messages like, ‘Just so you know: Everyone around you is being forced to listen to yer conversation’ and ‘The world is a noisy place. You aren’t helping things.’ Cards are attributed to the Society for HandHeld Hushing, or SHHH.
At last check, the file (.pdf) had been downloaded a quarter of a million times, Coudal said, though he doesn’t know of anybody who has actually passed out the cards.