Both sides of the city taunt each other with the same old song.
There's only one team in Manchester.
Of course the chant isn't true, but alter the lyrics a little and the popular putdown paints a more accurate picture.
There's only one brave team in Manchester.
Tomorrow morning (Singapore time), Joe Hart will watch Manchester City's Champions League endeavours from the bench. His role against CSKA Moscow is relegated to one of reluctant cheerleader.
Over in Spain at the same time, familiar faces are expected to trot out for Manchester United against Real Sociedad.
Shinji Kagawa may or may not be involved.
If he starts, he's unlikely to finish.
The Japanese midfielder's chances of fulfilling his professional obligations for a full 90 minutes are slim.
Wilfried Zaha, on the other hand, is already the forgotten £15 million ($29.7m) man. Sir Alex Ferguson's final signing is the first to underline David Moyes' hesitancy when it comes to picking the unpredictable.