Luis Enrique’s men had been written off after capitulating 4-0 in the first leg against Paris Saint-Germain, but fought back to win 6-1 and take their place in the quarters.
It was a tie fraught with tension, which looked impossible to turn around when Edinson Cavani made it 3-1 halfway through the second 45 minutes.
But while plenty of eyes fell on the referee for giving the hosts two penalties, Twitter fell over itself to congratulate Lionel Messi and the rest of Barca’s battlers.
Against all odds, Barcelona are now through to the quarter-finals for the 10th season in a row.
