are incredible...
Have you ever seen a hockey game live and up close and personal? Darryl, my brother Pat, his wife Cheryl, and I went to a Halifax Mooseheads
http://www.halifaxmooseheads.ca/main/index game a few years ago (they bought us tickets for Christmas that year), it rocked! We were up close to the glass and when they would come into the boards along the walls, it would shake like crazy.
Oh, isn't that soccer? Around here, this is football
http://www.nfl.com/ 
helmets required

edit for clarification