As two-legged Champions League ties go, Real Madrid and Barcelona's semi-final meeting in 2010/11 is right up there with the biggest in history.The two Spanish giants were arguably the two best teams on the planet at the time, while Cristiano Ronaldo and Lionel Messi were at the peak of their powers.Oh and you also had Jose Mourinho versus Pep Guardiola on the touchline, arguably the most famous managerial rivalry of all.While the football itself in both legs of the tie wasn't befitting of the quality of player on show, it was still sporting entertainment of the very highest order.The first meeting at the Santiago Bernabeu really was a heated affair, one in which Pepe - who was deployed as a midfield enforcer by Mourinho - was shown a dubious red card for a foul on Dani Alves.After that contentious decision, Messi scored twice, one of them an insane solo goal, to virtually put the tie beyond Real Madrid.In the second leg, Los Blancos did get on the scoresheet through Marcelo, but it came after Pedro Rodriguez's opener and therefore Barcelona won 3-1 on aggregate to reach the final - where they destroyed Manchester United at Wembley Stadium.
LONDON, ENGLAND - MAY 28: Lionel Messi (C,L) and Daniel Alves (C,R) of Barcelona hold the trophy as the team pose for photographs after victory in the UEFA Champions League final between FC Barcelona and Manchester United FC at Wembley Stadium on May 28, 2011 in London, England. (Photo by Laurence Griffiths/Getty Images)Overall, the Blaugrana probably deserved to go through, although as we previously mentioned with regards to Pepe's red card, they were aided by some refereeing decisions.One football fan on Twitter has highlighted that fact by creating a video compilation labelling the tie a "robbery".After watching, it's hard not to think that Mourinho and Real Madrid were victims of some poor officiating...
Video: Was Real Madrid vs Barcelona in 2010/11 a robbery?
Ronaldo being punished by the referee for being barged over by Gerard Pique? Check. Javier Mascherano committing the exact same foul on Pepe as the one that saw the Portuguese sent off and escaping a card? Check.
The word 'robbery' may be a little strong, especially given Messi's magic at the Bernabeu, but there's no getting away from the fact that the clips featured above are rather damning.
After the intense first leg, Mourinho delivered one of his most famous rants to date.
"One day, I would like Josep Guardiola to win this competition properly," the 'Special One' said. "If I tell UEFA what I really think and feel, my career would end now.
MADRID, SPAIN - APRIL 27: Pepe of Real Madrid is sent off by Wolfgang Stark during the UEFA Champions League Semi Final first leg match between Real Madrid and Barcelona at Estadio Santiago Bernabeu on April 27, 2011 in Madrid, Spain. (Photo by Alex Livesey/Getty Images)
"Instead I will just ask a question to which I hope one day to get a response. Why? Why Ovrebo? Why Busacca? Why De Bleeckere? Why Stark? Why?
"Because every semi-final the same things happen. We are talking about an absolutely fantastic football team, so why do they need that? Why?
"Why does a team as good as they are need something that is so obvious that everyone sees it? I don't know if it is the UNICEF sponsorship or if it is because they are nice guys.
"They have to get to the final, and they'll get there, full stop. Josep Guardiola is a fantastic coach.
BARCELONA, SPAIN - MAY 03: Head coach Josep Guardiola of Barcelona celebrates at the end of the UEFA Champions League Semi Final second leg match between Barcelona and Real Madrid at the Camp Nou stadium on May 3, 2011 in Barcelona, Spain. (Photo by Jasper Juinen/Getty Images)
"But I have won two Champions Leagues and he has won only one Champions League – and that is one that would embarrass me.
"I would be ashamed to have won it with the scandal of Stamford Bridge. If he wins it this year, it will be with the scandal of the Bernabeu.
"Deep down, if they are good people, it cannot taste right for them. I hope one day Guardiola has the chance of winning a brilliant, clean championship with no scandal."