Manchester United manager Jose Mourinho was at the centre of a heated bust-up at Old Trafford following an ill-tempered Manchester derby.
The Portuguese lost his cool as City celebrated their 2-1 victory after Nicolas Otamendi struck the winner after Marcus Rashford had earlier cancelled out David Silva's opener.
The Blues opened up an 11-point gap between the sides at the top of the table, with many surmising that the title race is effectively over.
While the Premier League trophy may be all but settled, the return fixture at Etihad will be highly anticipated after both sides' antics at full-time.
So what actually happened? Here's a run-down of the protagonists involved and what we know so far following the scarcely believable scenes at full-time.
What annoyed Mourinho?
Well, firstly a humiliating defeat to his personal rival Pep Guardiola and United's bitter rivals City. Though Mourinho, as he would later claim in his press conference, was upset that Michael Oliver failed to award a penalty as Ander Herrera tumbled following Nicolas Otamendi's challenge.
He then took issue with the raucous celebrations from Guardiola's side, which included loud music.
What happened next?
The United boss is said to have shouted into the visitors' dressing room to "show some respect," and was promptly sprayed with water and milk.
Mourinho is said to have even been struck by a plastic bottle.
One source has said that a milk carton was thrown against the wall, exploding and covering Mourinho's designer coat before he then walked off.
What happened between Mourinho and Ederson?
The City goalkeeper is alleged to have grabbed Mourinho by the arm to stop him from confronting other City players.
The pair are then said to have exchanged expletives in the pair's mother tongue Portuguese.
Mourinho was also displeased with Ederson for what he believed to be feigning injury in the closing stages of the game in order to waste time.
The former Chelsea boss is alleged to have later said in English to the Brazilian: "You f****** show respect. Who are you?"
Arteta injured by bottle
City's assistant coach Mikel Arteta suffered a facial wound after being struck by a bottle.
Romelu Lukaku , according to reports in Spain from Cadena SER on the show 'El Larguero,' is the player responsible for launching the bottle, which struck the former Arsenal star in the face.
With emotions spilling over, the Guardian claim police officers and stewards were forced into action with up to "20 players and members of staff" involved.
Punches were allegedly thrown from both sets of players with some officials looking on in disbelief.
The scenes brought back memories of the infamous 'Battle of the Buffet' at Old Trafford as tensions flared between United and Arseanl in 2004.
The FA are yet to react with any potential disciplinary ramifications for both side, with both teams back in action in the mid-week round of Premier League fixtures.