Manchester United got their 2019-20 Premier League campaign off to a perfect start as Marcus Rashford's brace helped Ole Gunnar Solskjaer's side to a stunning victory over Frank Lampard's shell-shocked Chelsea side.
The Red Devils took the lead, against the run of play, in the first half when Rashford converted from the spot after the striker was fouled by Kurt Zouma, who endured a tough afternoon at Old Trafford.
Chelsea hit the woodwork twice but rarely tested David de Gea once they fell behind, and the hosts doubled their lead in the second half when Anthony Martial got on the end of Andreas Pereira's cross to poke home past Kepa Arrizabalaga.
Things went from bad to worse for Lampard, who was making his Chelsea managerial debut, when Rashford collected Paul Pogba's incredible long-range pass before doubling his tally with a well-taken effort.
And substitute Daniel James, making his Premier League bow after joining from Swansea this summer, got in on act as he marked his first appearance for United with a memorable goal.
Here are seven talking points from the match...
1. Lampard sticks to his word
On returning to Stamford Bridge as the new Blues boss, Lampard made it clear that he would give younger players the chance to impress this season.
He stuck to his word on Sunday by giving a number of starlets a start against United - notably Mason Mount and Tammy Abraham, who impressed on loan last season at Derby and Aston Villa respectively
Abraham almost repaid his boss within four minutes at Old Trafford, the talented striker smashing David de Gea's post with a well-hit effort - but he ultimately endured a tricky match against Harry Maguire and Co.
Mount, meanwhile, was equally as impressive early on. He pulled the strings in a free-role for the visitors, proving a threat on the counter-attack and even tested De Gea on several occasions before feeling a bit lost in the second half.
2. Ole's new look defence
Two of Solskjaer's big-money summer signings came straight into the United starting line-up to make their debuts against Chelsea.
And Aaron Wan-Bissaka, the £45million arrival from Crystal Palace , and £80m-centre back Harry Maguire, who joined from Leicester, gave us a glimpse of what we can expect from United in years to come.
Wan-Bissaka took little time displaying his undoubted ability. Just one minute, to be precise, with the full-back thwarting Emerson early on before calmly playing the ball out of danger.
Maguire also fitted seamlessly into this new-look defence, the England international looking composed in the heart of United's defence - and Solskjaer will no doubt be hoping they can kick on from here.
3. Penalty-king Rashford
United were on the backfoot for the early stages of this encounter but were given the chance to take the lead when Zouma fouled Rashford in the box.
The England striker duly stepped up and converted his spot-kick to break the deadlock for United against the run of play.
And the opener means Rashford has now scored all four of the penalties he has taken in competitive senior matches for club and country - including shootouts.
Given England's misfortune in penalty shootouts over the years, he could well prove to be an integral players in years to come.
4. Will Chelsea regret selling Luiz?
Chelsea also had different look to their defence - the most notable absence was that of David Luiz, who left the Blues for London rivals Arsenal on deadline day.
Zouma was handed the chance to stake a claim for a first-team place, the former Everton loan star perhaps seen as a long-term replacement for the departed Brazilian.
However, he endured a nightmare afternoon. The defender was sloppy in possession and was to blame for United's opener, after he needlessly fouled Rashford in the box.
It seemed that early mistake rattled him, as he struggled throughout and later picked up a booking in what was a miserable opening half. Perhaps life without Luiz may not be that great after all...
5. United's No.9 delivers
Martial recently reclaimed the number nine shirt following the departure of Lukaku, who quit Old Trafford to join Inter Milan on deadline day.
The Frenchman was given the number when he arrived from Monaco in 2015 but, despite making a big impact in his debut season, it was taken off him the following summer when Zlatan Ibrahimovic arrived.
It was a controversial decision considering Martial had developed an am9 brand based on the shirt - but he'll no doubt be delighted to don the famous jersey again.
The forward delivered for Solskjaer with a well-taken goal, and will be hoping to kick on from this stunning start.
6. A debut to remember for James
Solskjaer has made it clear that he is willing to be patient with the £18m winger and decided to start him on the bench against Chelsea.
The Welsh starlet was eventually introduced to the Old Trafford faithful with 16 minutes to play, replacing the impressive Pereira.
And seven minutes after his introduction, the Red Devils new boy was running into the corner flag celebrating with Wan-Bissaka, having notched a dream debut goal.
He has Paul Pogba to thank, after the French World Cup winner powered forward before playing in James - and the winger was able to find the back of the net with the help of a deflection from Chelsea left-back Emerson.
7. United make their feelings known
Despite their team going on a hefty summer spending spree, United fans are seemingly still fuming with the club's owners The Glazer Family.
The online #GlazersOut movement have campaigned for the resignation of Manchester United's owners and they flew a banner over Old Trafford.
The banner, which contained the words 'GlazersOut', made an appearance during the game and was the latest in a number of protests against the American owners.
Surely they can have few complaints on Sunday night, though, after their side registered a stunning victory over their old rivals from west London...