After Thomas Muller opened the scoring four minutes in, Barcelona found an equaliser three minutes later from an unlikely source: Bayern defender David Alaba.
The Austrian, normally so reliable, could only swipe at a cross from Jordi Alba, sending the ball looping over Manuel Neuer to level the quarter-final at 1-1.
The left-footed Alaba used his right foot in his attempted clearance, partially explaining its unintended outcome as the favoured German side were pegged back.
Alaba is usually a reliable performer for the Bundesliga champions, who are "cautiously optimistic" they will be able to tie the defender down to a new contract.
Just 14 minutes after Alaba's own goal, Bayern went back in front after Ivan Perisic struck to give his side the lead again. And in the 27th minute the lead was doubled as Serge Gnabry struck for Bayern, before Muller scored again to make it 4-1 in the 31st minute.
Things would get even worse for the Blaugrana in the second half as they would concede another four goals in an embarrassing 8-2 defeat.
After a lightning-fast start to the match, there was plenty of reaction to Alaba's own goal.
Fair play to Alaba, he wants to make the match interesting.— Troll Football (@TrollFootball) August 14, 2020
7’—Barcelona 1-1 Bayern— B/R Football (@brfootball) August 14, 2020
🗣️ ARE YOU NOT ENTERTAINED? pic.twitter.com/eSGKzPdrUO
Alba to Alaba— Sid Lowe (@sidlowe) August 14, 2020
Has there ever been an assist-goal combo like it?
Stevens to Steven?
Waddle to Hoddle?
Alaba and Varane: two of Europe's best defenders this season, and in this knockout stage both having - shall we say - moments to forget.— Musa Okwonga (@Okwonga) August 14, 2020
To those who are talking about Alaba and his own goal... don’t mock it until you’ve tried it 😉 #owngoalking 👑— Stephen Craigan (@stephencraigan) August 14, 2020