If Manchester City were to humiliate Manchester United by six goals to one this season, few would be all that surprised.
Back in 2011, it was almost unthinkable.
Three years after Sheikh Mansour's takeover, Roberto Mancini's side provided the Red Devils with a taste of what was to come. The power was beginning to shift.
It remains United's worst home defeat since February 1955, which incidentally also came in a 5-0 loss to City.
Sir Alex Ferguson's side had never lost by such a margin in the Premier League, while the club had also not conceded six goals at the Theatre of Dreams since 1930.
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Then City arrived. Was this the star-studded line-up we've come to expect from the current champions? Not quite, but it was beginning to take shape.
The two teams lined up as follows:
Man Utd: De Gea, Smalling, Ferdinand, Evans, Evra (c), Nani, Fletcher, Anderson, Young, Rooney, Welbeck
Man City: Hart, Richards, Kompany (c), Lescott, Clichy, Y Toure, Barry, Milner, Silva, Balotelli, Aguero
Edin Dzeko came on to score twice, while David Silva, Aguero, and Balotelli (2) also helped the visitors to run riot and inflict a scoreline which United fans would rather forget.
Why always me?
Yet nobody will ever forget it and not just because of the scoreline.
The game also provided us with one of the most iconic celebrations of the Premier League era as Mario Balotelli asked: 'Why always me?'
The Italian had that very week been involved in an incident when he set off fireworks in his own house.
That wasn't his first faux pas either.
Just days after joining City, he had crashed his Audi on his way to training. When the police then asked why he had £5,000 in cash in the car, he replied: "Because I am very rich".
By the time he unveiled his 'Why always me?' shirt - which itself inspired a grime track called 'Mario Balotelli' - he had infuriated Mancini on a number of other occasions.
In his first season, he was sent off against West Brom for clashing with Youssouf Mulumbu and claimed he'd never heard of Jack Wilshere when he beat the midfielder to FIFA Young Player of the Year.
The striker then ended that campaign by reportedly throwing a dart at a City youth team player and being sent off again in a Europa League tie with Dynamo Kiev.
By the summer of 2011, it looked as if Mancini were ready to give up on him when he attempted an outrageous back-heel and put the ball wide in front of an open goal in pre-season.News Now - Sport News