Trev, I don't agree with you on that.
The Hamburg atmosphere was because of the gravity of the game, nothing to do with flags.
The United game will be just the same - the roof will be coming off without any banners or bananas or whatever else they dream up.
As an aside, pretty much everyone will tell you that the best atmosphere at Maine Road for the last 3 or 4 years at least, was the last derby. Did you know that the PA system broken down for that game? That allowed the atmosphere to build like it used to in the 80s. I remember getting to my seat 10 minutes before kickoff and already you could hardly hear yourself think.
Turn off the tannoy. And don't play that shawaddywaddy bloody Bluemoon. The hologram is good, I think, but not the music.