FOX (ended 2002)
Great list! Here's mine (all of these are done by me or one of my friends)
1. After hearing about Serenity Day, you plan an elaborate campaign for your own town (involving a day devoted to each character the last two weeks of school)
2. Your lunch table randomly breaks out into "Ballad of Serenity" at least once a week
3. Your desk in french class is a shrine to Firefly/Serenity quotes
4. You search for Jayne's hat
5. Chinatown is your new favorite place to shop
I'll probably think of more later.