My father in law (god rest him) told me a story once from some years ago.
City were playing Everton at Maine Road and he was stood in the North Stand where it was mixed fans.
My father in law was a cop at the time and had to ask this particular well groomed Evertonian to wind his neck in as every other word was Fuck, shite, cunts....You get the picture.
Well, his reply to my father in law was something along these lines.....
'By day and night young man I perform brain surgery, at the match I take my own brain out so that I can have a shout and swear, it relieves the stress'
Not much you can say to that.......?!