I am an advocate of unconventional advertising and thinking outside the box. It doesn't even have to be a wild, crazy, or unthinkable, it's just an added plus if there's something a little creative or different.
So here's an attempt by a fitness company in Europe, making people aware of their weight - Sit on this bench and voila, your weight is displayed to the world. A subtle motivator for someone to join the gym I suppose. found via gizmodo.com