Outkickthecoverage.com treats the world to a wonderful dissertation on fans who suck out loud.
No. 1 on the list? Well, that would be Alabama football fans. Frankly it's kinda hard to argue with this. The article is priceless, if you have the time I highly recommend you read it.
No. 2 you ask? Well, let's just say I'm stunned this hasn't been posted here already. Unless it has. In which case I'd apologize but some things you just can't have too much of - like money, or good scotch.