It was supposed to be Jose Mourinho's triumphant return to the Nou Camp. Instead he had his very own Black Monday – a 5-0 defeat against Pep Guardiola, the biggest and bitterest of his career in front of an estimated global audience of 400 million.
As he prepares for his first Manchester derby on Saturday he will doubtless cast his mind back to the first meeting between the two in La Liga six years ago.
No one expects Guardiola v Mourinho Premier League Round One to go the same way, but then nobody expected it on November 29, 2010 either.