The Onion's A.V. Club has a list of the top 20 nerdiest pop-culture obessions.  A lot of what you expect gets a shout out:  Star Trek, Buffy, D&D, Renaissance Fairs.  But there also are some interesting choices, like Frank Zappa and The Simpsons. 

Then there are some obsessions I've never heard of, like game show tape trading.  From the description:  "so the stalwarts gather on the Internet, offering videocassettes and DVD-Rs of Classic Concentration and The Joker's Wild, and comparing notes about the greatest hosts, the greatest contestants, the greatest celebrity guests, and the greatest eras of long-running series. And the really faithful gather in person at the Game Show Congress in Los Angeles, where they attend panels, meet legends, and play the games themselves." 

Come to think of it, I can't remember the last game show I watched.  I think they should have a trivia show about The Wire - not only would I watch, I would totally dominate. In fact, in the spirit of the list, maybe there should be Wire role-playing games.  Oh Oh, I get Omar.  Or Bubbs.  Even being Avon or Marlo would be fun for stretch.  Totally scaring myself.  

Back to the list, Rocky Horror Picture Show is on it, as is World of Warcraft - to which the listers say:  "Five minutes in a room with any two World Of Warcraft players will drive any non-player mad, amid jargony babble like "Next time we run MC, sheep one of the core hounds while I rush in and pull aggro. Damn, I wish they hadn't nerfed paladins."  Every show/game/fantasy has its own jargon.  Like for me, I often say to myself, "Yo, a man's got to have a code.  You feel me?"