Well, here are mine, and I'm guilty of every single one:
1. Whenever you hear a song, you imagine it as an AMV.
2. When you go shopping, you look around for clothes you can alter for cosplay.
3. You have cosplayed as a character.
4. You are as passionate about shipping as though it were real life.
5. You have accepted yaoi and yuri.
6. You own merchandise from any show that you have watched.
7. You have gone to an anime convention.
8. You are a member of an anime or japanese oriented club.
9. You have tried to teach yourself Japanese.
10. Your room is decorated with anime posters.
11. You pretend that you are a ninja.
12. You listen to anime theme songs.
13. You wear a cosplay item to school, like a Naruto headband or Katara's necklace.
14. You go to school in full cosplay on Halloween.
15. Your body physically reacts when the action in the show is at its height.
16. You mostly talk about anime with your friends.
17. Anime comes before school dances. I mean, if it's Friday at 8:30, where would you rather be? Homecoming dance or on the couch spazzing about a new avatar ep?
18. You wear anime T shirts to school.
19. You have had a serious crush, not a joke crush, on a character at least one point in time.
20. You can relate almost anything in real life to an anime.
21. You have the temptation to glomp anyone reading a manga.
22. You draw anime.
23. You have spent A LOT of money on anime related merchandise ($200 at Anime Boston alone xD)
24. When you are happy, you blink your eyes in the "happy" position like the characters do on anime.
Well that's all I can think of for now, but it's a hefty start xD