Only trouble I did see apart from the odd can/bottle thrown and exchange of heated words, was before the game on the the walk to the ground. In our group of about 15 of us, one of our number, who's 66 and had a heart attack a few years ago, but is still one of the scariest blokes I know, put his head onto a rag who sounded like he was from Yorkshire and who, arms spread, walked past us with 4 or 5 others and screamed 'United' in the face of one of our lot. It was too tempting not to give the fucker a kick or two on his way down after that and re live, for a brief moment, the 1970's. The other inbreds then gave it "Fuck me lads, no trouble, no trouble etc' and picked the first one up. We all then agreed that it was a bit of an over reaction, all shook hands, said that we hoped the game would be a good one and went on our way. Our psycho OAP, who wouldn't apologise parted with the comment of 'Next time, I'll do the fuckin lot of yer, you Yorkshire m****h cunts'. We calmed him down, gave him his heart pill and congratulated him on an absolutely stunning performance. Absolutely true story.
