Originally from the musical Carousel, this got adopted by the fans of the English soccer club  Liverpool, and has since spread widely to other teams.  I've twice been in stadiums when the entire crowd starts singing it, and its simultaneously awe-inspiring and a little scary.

The hooligan aspect of it is pretty repellent, as oscar notes.

Would get a perfect 5 star rating if we were all English soccer hooligans, its one of their big tunes over there, or was...they also have this at the end of a good Pink Floyd song from "Meddle" called "Fearless..."