Fans are as integral to sports as the players themselves. Without the support of an exciting crowd, athletes are just a bunch of fit guys playing games together. But while fan frenzy makes games more exciting, some guys give the crowd a bad rap.

Whether it's the guy who yells obnoxious things across the field or posts racist Tweets when a team is losing, there are certain fans that deserve to be voted off sports island. Bleacher Report shares a list of the 21 ways sports fans can be terrible.

For a look at the more entertaining side of sports fandom, check out these crazy sports fan photos.