The Game: A continually-run D&D campaign, since 1982
I was obsessed with D&D in junior high and high school despite never actually playing for more than a few hours. I had binders full of NPC character sheets, a multiple continent world designed (which included, among other things, Middle Earth and Prydain plus many modules, both the letter-number'd ones and modules from Dragon magazine.<p>In college, there was a group who played in the dorm lounge and hearing them play, I ended up losing interest in the game. My imagination of how the world I'd designed would come out and the reality of a game just didn't conform to each other.