Lots of arenas have them, just some of them are more crazy than the others :)
Does your local sport arena has any stand-out fans?

Chelsea Fans Wallpaper #1
Size: 230 KB
Resolution: 1024×768
Author: Football-Wallpapers.com
Photo Credits: AP Photo/Kirsty Wigglesworth
Info: A sea of Chelsea flags are seen during the Champions League semifinal first leg soccer match between Chelsea and Liverpool at Stamford Bridge in London, Wednesday April 25, 2007.