Remarkably, when Manchester United host Barcelona on Thursday night, it will be just the 15th meeting between the two footballing behemoths.
With eight European Cups shared between them, the two clubs have a rich pedigree bettered only by a very elite group of teams. Between 2008 and 2011, the Red Devils and the Blaugrana contested a pair of Champions League finals and one semi-final.
That the latest meeting comes in the Europa League play-off round should be an indicator of two giants in a slump. So why are both fanbases so excited about the direction they find themselves going?
