This week on City Is Ours we'll be taking a daily look at memorable moments from that famous day at Old Trafford.
October 23 2011, the day Manchester City beat neighbours Manchester United 6-1 in the derby.
Why always me; David Silva's incredible assist; it should have been 10; the start of a new era - all are topics fondly talked about by reminiscent Blues.
However, of City's six goals that day, there is one that feels especially significant.
When Mario Balotelli stabbed home his second of the afternoon, little did he know that he had just scored a goal that would come to define the champagne football of the new City. It was the City goal.
With two United men closing him down 25-yards from goal, Silva laid the ball back to Micah Richards, the City right-back standing just a few yards behind him.
He rolled a pass out to James Milner, hogging the right touchline, who flicked a first time lay-off into the path of Silva , who had lost his marker and was running down the right channel.
That first phase of build-up used the passing in triangles method popularised by Johan Cruyff, and used by City today under Pep Guardiola.
The City trio dragged United's left-sided players (Patrice Evra and Ashley Young) out of their defensive shape, leaving a gaping hole in the left channel. All Silva had to do was drift past an absent-minded Anderson and he had a clear run at the penalty area.
The Spain great scampered towards the box with Anderson in pursuit but, realising that Balotelli was being marked in the centre, he pivoted just as he looked poised to cross.
Instead, Silva shielded the ball for a few moments - a little bit of pausa for you, Pep - before deploying another classic City move. The overlap - a ploy used so effectively here at Old Trafford that Gary Neville decided to name a podcast after it.
With left-back Evra still out of the picture, Milner ran by Silva's right shoulder unopposed and duly received the ball to run on to. By this time Balotelli had stolen half a yard on Chris Smalling, with the help of a well-timed nudge in the back, and that was all he needed to find the space to convert Milner's pin-point delivery across the face of goal.
It's a goal that provided an eerie foreshadowing of what was to come for City over the following decade. Guardiola became City's manager roughly four years and eight months after the 6-1, but that second goal bears all the hallmarks of a classic Pep goal.
City under Roberto Mancini were decidedly un-Cruyffian. They liked to counter-attack, they didn't insist on playing out from the back, they never played with a front three and they always operated with at least one striker.
Yet almost every aspect of that second goal - the passing in triangles, the clever touches, the overloading on one wing, the reluctance to put the ball in the box for the sake of it and the overlapping run, all spoke of the influence that Guardiola's Barcelona side were having at the time. It also spoke of the intuitive and timeless brilliance that Silva would bring to bear in many of City's finest outings under Pep.
For the rest of the historic title-winning season of 2011/12, and pretty much ever since, it felt like most of City's goals were scored like that. Tasked with explaining a 'Typical City' goal to someone not into football, and you'll likely end up describing something pretty similar.
Ten years on from the greatest of derby day victories, a lot has changed at City. A different coach sits in the dugout, the style of play has evolved and new names adorn the backs of shirts.
But what is woven into the fabric of the modern Manchester City is that goal. Pass, move, cross, finish. At the time, we just didn't know it.
What was your favourite goal from the 6-1? Follow City Is Ours writer Alex Brotherton on Twitter to join the conversation and let us know your thoughts in the comments section below.
