i would poop myself if i noticed some of these in real life...
ambient media advertising!
Koleston natural hair ad
http://thrivenowforyourfuture.com/ I love this. Look how they use nature as a canvas with the negative shapes in the subject matter. Very creative. You have to look at the billboards. I would of added a bit more direct response to it, but it is beautiful branding.
This was a real New York City ad stunt, from 2006. Stickers were placed over several steaming manholes in Manhattan. Unfortunately, Folgers couldn't alter the aroma of the steam, which smelled like sewage.