This time it was 17-year-old Copenhagen wonderkid Roony Bardghji, securing the most incredible 4-3 Champions League win for the Danish side.
United earlier looked like they were cruising to an easy win thanks to Rasmus Hojlund, who scored his fourth and fifth Champions League goals since his £72million arrival for a commanding lead.
However, a red card for Marcus Rashford in the 42nd minute kick-started a downward spiral even unbelievable for the 2023/24 iteration of the Red Devils.
Erik ten Hag's ten-men conceded once to former Southampton winger Mohamed Elyounoussi, and then again from Diogo Goncalves to give the Dutch manager the most brutal of half-time team talks.
However, his side were given an absolute gift to restore their qualification hopes soon after the break, with Bruno Fernandes scoring from a soft hand ball decision against Lukas Lerager.
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Things then got better for United with news coming in from the other Group A game, where Harry Kane fired in a late hat-trick as Bayern Munich saw off Galatasaray, one of United's rivals for third in the group.
However, the aforementioned Lerager, who was left shaking his head at the penalty call, hadn't given up, scoring an 83rd minute equaliser to send Parken Stadium into raptures.
Then, when things couldn't get any better, they did just that, with teen superstar Bardghji coming off of the bench to take all three points and leave his namesake's former side in utter disbelief.
The result meant United went from second to bottom of Group A, and their Champions League last 16 hopes are now hanging in the balance with two games to play.