[gambiting]

As others have said, European football. When I was a teenager you'd get stopped on the street by "hardcore fans" and asked which side are you on - answer incorrectly or not at all and you're getting a mild couple punches, or if they had a few drinks then a good kicking on the ground. When there was a major football match in town then the streets would become deserted - the opposing side's fans were 100% guaranteed to pour out of the stadium and look for a fight with anyone. It would get incredibly brutal and people sometimes died. There's a reason why buses of football fans of some clubs are heavily escorted by the police whenever there is a match.