Fans are the lifeblood of sports—without stands filled with men and women who live and die by their favorite teams and athletes, sports would merely be recreation. The high school gym class and intramural frisbee.
In short, through their passion and cold hard cash, fans give sports meaning.
Like any relationship born with an unbreakable link, it isn't always pretty, but the two parties have to learn to live with each other. Because one wouldn't exist without the other.
Some of the greatest moments in sports are those occasions when fan and team joined together in harmony—celebrating a world championship on the streets of their city or giving a standing ovation as a future Hall of Famer leaves the field for the last time.
However, fans are often the culprits behind some of the most ugly moments in sports.
As spectators, we can't suit up and change the momentum. We can't arrive to practice early and get ready to win next week. All of these raw emotions—in the role of the vicarious "12th Man"—sometimes lead to poor decision-making and behavior that would seem completely alien in any other setting.
These are 21 ways that some sports fans can be terrible.
And please remember, these aren't personal accusations directed at you—so keep it together.