Over the years we came across many referee decisions that did a big impact on the game and all resulted in us leaving the champions league in knockout stages. And you ask a united supporter the first incident that comes in mind is the Nani sending off against Real Madrid in 2013 So many argued that it was a not a red card and it was a bad decision and at max should be a yellow card. But the game went on and we lost after playing with 10 men in 35 mins. But for me the one that I still feel angry about until this day the disallowed goal of Paul Scholes against Porto when we were leading 1-0 and 2-0 could have killed the game. If we had won this game we could have won our 3rd UCL that year. But was these the most famous stupid referee decisions we have ever seen? Sure No, Luke Shaw's horror injury against Eindhoven is one of the worse referee decisions ever made. We lost Shaw when he was on fire and affected our season and the game when we were 1-0 and sending off Moreno with a penalty could have sealed the game and our race in the group. Is that all? I can mention many important decisions were made against us like 2010 sending off of Rafael against Munich. The Aldo Duscher against David Beckham and we lost him for the rest of the season, Duscher got only a yellow card for that reckless challenge and he was hailed as a national hero in Argentine for sending Beckham off the world cup. Although we won against Deportivo but Beckhams loss did affect our CL when we got out in the semi-final against Leverkusen. Do you remember any other big decisions in the UCL?