Quite amazing that they managed to pull this off. http://www.dailymail.co.uk/sport/fo...all-unveil-mosaic-rivals-Steaua-s-ground.html
For those who don't want to fund The Daily Mail "Steaua Bucharest's stadium display before Tuesday's Champions League match against Manchester City was sabotaged by rival supporters in what has been called one of the biggest pranks in football history. Undercover Dinamo Bucharest fans planned the prank perfectly. They placed coloured vests on the chairs in a section of the stands at the 55,634-seat National Arena in the Romanian capital and unsuspecting fans put them on just before kick-off. Instead of displaying a message celebrating Steaua's 1986 win, theirs said: 'Doar Dinamo Bucharest' (Only Dinamo Bucharest) in the red-and-white colours of Dinamo." Only Romanians there will have known what was happening I suppose.