http://economictimes.indiatimes.com/news/news-by-industry/services/advertising/the-talking-window-will-bone-conduction-technology-be-used-in-advertising/articleshow/20936833.cms
So Sky Germany may be trying to advertise directly into the heads of sleeping passangers on trains by bone conduction.
WTF?
What do you guys think? And theoretically a tinfoilhat that is thick enough might actually be of use here ^^