One night, lots of people were running through the streets, shouting and throwing rocks. It was all about a soccer game. They were soccer  and they were angry that their team had lost an important game. They went completely out of control.

    It's common  fans to get crazy. So many cities choose to put more police officers on the streets after big games.  makes fans so crazy?

    Some experts believe it goes back to a long-ago time when humans lived in tribes (部落). These tribes  each other for food, land and power (权力). You supported your tribe's warriors (武士) because your life  on them.

    Today's“warriors” are athletes (运动员). Cheering for  can bring out the same life-or-death feelings. That can be exciting and fun. It also  problems if the strong feelings last (持续) hours or days after a game has ended.

    On the other hand, some people say that being a sports fan can make you a happier and  person. Research shows that if you have a strong connection to a team, you might make strong connections with people. Many fans feel a sense of belonging to a group. They are less  and have more enjoyable social lives.

     your favorite teams make you a bit crazy sometimes, it's only because you love them. And that's good — if you can remember that it's only a game.