It’s hard to drive anywhere in the city right now without seeing an irreverent bumper sticker. Here's how the trend went ...

You may not have noticed them before, but once you start looking for the inconspicuous yellow stickers you will spot them ...

Marni Rose McFall is a Newsweek reporter based in London, U.K. Her focus is on U.S. politics, social affairs and popular culture. She has covered fashion, culture, art and music extensively.