I just pwned myself. :-( Do the test. Explanation:
People often fail to see a change in their surroundings because their attention is elsewhere. Researchers at Harvard University played this trick on some unsuspecting people and over 50 per cent failed to spot the change. The aim of our Cycle safety campaign is to reduce the number of cyclists that are hurt on London’s roads.
https://www.youtube.com/watch?v=Ahg6qcgoay4