If you are one of millions of Londoners who stoically battles through the Tube's rush hour commute, you will no doubt pass dozens of Transport for London signs and notices on your journey. It's a form of rebellion, whether it be due to the current climate of doom and gloom and people wanting to brighten their day.
See stickers on the central line
or visit the london-underground.
Similar stickers are also appearing in Viennese Metro, so watch out