The Manchester derby isn't Man United's most important game of the domestic season.
But since 2008, when Manchester City's new-found riches meant they were able to compete with United for the first time in the Premier League, it has been a particularly fiery fixture.
In 2017 the world discovered just how fiery when Man City beat United at Old Trafford to go 11 points clear at the top of the table.
Here we look back at the match and the aftermath in which a huge row broke out behind the scenes at Old Trafford, resulting in then United boss Jose Mourinho having milk thrown at him and then Man City assistant Arteta being him in the head with a bottle.
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The derby at Old Trafford
There was a lot riding on the match before a ball was even kicked, with the outcome going a long way to deciding the 2018 Premier League title winners.
David Silva opened the scoring for the away team two minutes before half time, but United hit back moments before the whistle was blown through Marcus Rashford and the two sides went in level at the break.
City's breakthrough came just nine minutes after the restart when centre-back Nicolas Otamendi restored the away team's lead.
United had half an hour to draw level, but Pepe Guardiola's side held on to go 11 points clear at the top of the Premier League table, effectively ending the title race.
The result also ended United's 40-match unbeaten run at home, while City became the first team in English top-flight history to win 14 successive games in a season.
Guardiola and Mourinho shook hands as soon as the final whistle was blown, with the Spaniard joining his players on the pitch to celebrate and the Portuguese heading off down the tunnel.
Man City's celebrations begin
While the Man United players were in the home changing room, presumably receiving a dressing down from Mourinho, the City stars slowly made their way back down the tunnel.
City keeper Ederson was photographed celebrating next to a large Man United badge on a wall inside Old Trafford, while Kyle Walker made a 2-1 gesture to the camera.
Inside the away dressing room the music was turned up high and players posed for pictures as one individual threw ticker tape into the air in celebration.
Mourinho goes to complain
Frustrated by the result, and the sound of the partying going on in the away dressing room, Mourinho decided to delay his post-match media obligations and complain to City.
The Portuguese did this by walking towards the away dressing room – the door to which was open – and ordering the City players to "show some more respect".
Furious argument ensues
Mourinho's words were like fuel to a fire and received an angry reaction.
The Portuguese is said to have been sprayed with water and even struck with a plastic bottle.
Infamously, a carton of milk was then thrown in his direction, exploding off the wall next to him, missing Mourinho but covering one his his staff members.
Things suddenly turn nasty
Manchester City goalkeeper Ederson then got involved in the row, with the duo trading insults in Portuguese.
It is alleged Ederson even grabbed Mourinho's arm, with the Portuguese telling the Brazilian: "You f****** show respect. Who are you?"
Reports claim other players then got involved as Man United stars became aware of what was going on down the corridor at Old Trafford.
Arteta injured by a bottle
Some reports at the time claimed things threatened to turn physical, but sources from both clubs said no punches were thrown by either side in the melee.
A plastic bottle, however, was thrown, which hit then Manchester City assistant Arteta square in the face, leaving him bleeding from a cut to the head.
At the time it was alleged that Romelu Lukaku threw the bottle, but this was never proven.
Some reports claim police were called to stand guard outside the two changing rooms once the situation calmed down.
But other reports contradict this saying once things had relaxed, players from both clubs were actually seen talking to each other on friendly terms.
Guardiola's post-match reaction
On the incident: "What happened in the locker room happened. Hopefully it is never going to happen again.
"If we were not correct then I apologise to Manchester United. But our intention was not that – it was to celebrate inside the locker room and if people cannot understand that, I'm sorry, we won a derby.
"If we offended United then I apologise but sometimes United have made a lot of celebrations in the past over City."
On encouraging his players to celebrate: "All I can say is, it was a game in a nice stage and a nice stadium. The players were in the game, everybody fight to win the game.
"After the game the players shook hands, no problems at all. Some players went to celebrate with the fans like normal.
"I encouraged the players to celebrate the result. I am the guy who encouraged them to celebrate in the moment.
"When United win they celebrate, when Arsenal win against United they celebrate, when Arsenal win the FA Cup last season they celebrate… But where? Inside the dressing room.
"People have to understand that we were happy. I think all the teams around the world when they win a derby, they are so happy.
"When we won with Bayern we were happy, with Barcelona we celebrated. We will make a statement to the FA. I am not going to comment about that."
Mourinho's post-match reaction
On whether his players may be punished: "I think you [the journalist] work for another club and not for the press."
On whether his players acted the right way: "I know [they did]. I am not confident – I know."
On whether Lukaku threw the bottle: "Accused? Prove [it]. Show evidence, then punish him."
On United celebrating in a more humble fashion after beating Arsenal the previous weekend: "The only thing I can say is that, for me, it was a question of diversity. Diversity in behaviour, diversity in education… the diversity of behaviour, of opinion, of education."
On his claim being in response to Guardiola's comments: "Yes, exactly. What we did in the Arsenal stadium, you know? It was completely diverse [to City's conduct]. What we did, what happened after that match, the way we behaved as winners."
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