Most sports fans out there are thoughtful and relatively even-keeled. They have a couple beers at the game, cheer the team on and act as a positive ambassador for their sport wherever they go.
But as we all know, bad fans certainly do exist. Some make us cringe with their creepy fanaticism, and some need to be locked up for their own good and our own personal protection. And when they get on camera they can really do some damage to their fan base.
The following 15 videos covers everything from the weird to the violent fan, and how they can give the rest of regular sports guys a bad name.