"You know when you lose all your hair? When your wife of 41 years is a United fan simply because she used to babysit two of Denis Law's five kids for a brief period," chuckles Dave Oldham, one of Manchester City's veteran tour guide.
A few minutes drive at the Old Trafford, you meet 20-something Oliver, who works at the Manchester United museum.
Do you know Oliver, how to go to Etihad Stadium from Old Trafford, you ask hoping for a reply.
"Etihad Stadium? Now what's that? We don't know which club you are talking about. We don't know where it is," he answers with a straight face before you get a sly grin.
They are not just employees of the two clubs, they is a die-hard fan in each one of them as well. And when in Manchester, you are either a 'Red Devil' or a 'Citizen'.
They are separated by 16 years, United is now 141 years old while City is celebrating its 125th year. However, there is no love lost between the two neighbours and their fans can't stand each other.
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They take potshots at each other, remind each other of their achievements and are an intrinsic part in Manchester's essence.
City, the reigning EPL champions, certainly hold the bragging rights but when it comes to worldwide footfalls and legacy, the United are in a league of their own.
The humours and digs are distinctly British as Dave's tongue in cheek one liners.
As he led the tourists inside the Etihad Stadium, he would point at the sky, "As you can all see the clear skies here and the dark clouds hovering over that club (United) on the other side of city."
Or while showing the visitors dressing room, he would tell tourists, "We don't have a mirror which starts from the ceiling and touches the floor. We don't have it since Cristiano Ronaldo doesn't play for United."