[url=http://www.telegraph.co.uk/technology/apple/10330414/iOS-7-users-destroy-iPhones-after-fake-waterproof-advert.html]Apparently, it was 4Chan.[/url] So someone decided to make a fake, but real looking ad that claimed that once updating to iOS 7, an internal drop-in-the-water emergency switch would flip, making it waterproof. This, of course, was fake. Which lead many people to render their phones useless.