Ole Gunnar Solskjaer oversaw a stunning reunion with bitter rivals Leeds as Manchester United scored six in a home Premier League match for the first time since Alex Ferguson retired.
The Norwegian came on as a substitute in the last league meeting of these old foes in February 2004 and masterminded an unforgettable victory when they renewed hostilities at an empty Old Trafford on Sunday.
Scott McTominay's superb early brace set the tone in a wild first half in which Bruno Fernandes and Victor Lindelof also scored before Leeds captain Liam Cooper clawed one back.
Daniel James and Fernandes increased Manchester United's lead before Stuart Dallas' stunner saw the match end 6-2, making this the first time the Red Devils have netted six since winning 8-2 against Arsenal in 2011.
Ferguson was in charge then and enjoyed this triumph from the directors' box at Old Trafford, where McTominay became the first player in Premier League history to score twice in the opening three minutes.
Fernandes fizzed home as Manchester United scored as many in the opening 20 minutes as they had managed in their previous six home league games, before Lindelof directed in a fourth from a corner.
Cooper reduced the deficit as Leeds deservedly pulled one back, but the home side's quality made the difference in an encounter as intense as it was entertaining.
James, so close to joining Leeds in January 2019, extended the hosts' lead, before Fernandes coolly converted a penalty and Dallas grabbed a fine consolation in a match bursting with chances at both ends.
McTominay told Sky Sports: "We know Leeds' strengths and weaknesses and it was a good game for me - I'm used to playing high energy and high-tempo football matches and we played really well today.
"Everybody knows Leeds are an amazing team with an amazing coach, the detail they go into off the ball is high and we've done a lot of analysis on them and it pays off when we get six goals.
"We were saying in the dressing room how we need to score more goals at home and turn the place into a fortress so teams are scared to come here."