1)You record each and every episode of Case Closed(Which is what I'm doing..lol)
2)You go online and search for Detective Conan music...not bothering to talk to any of your friends that im you..you tell them you're busy and sign off, then continue on your madman search(Yes, I've done that!)
3)You start a fanfic on Case Closed and wonder how you're gonna finish it before you even start it
4)You listen to the 38 second sample of the Detective Conan background music over and over again(I really don't know the name of the song, it's on the show every once in a while!)
5)You draw your favorite picture of Case Closed and stick it on every forum post to this site that you reply to(Incase you haven't noticed, this is what I'm starting to do...lol...MY CONAN! lol)
6)When you go to any laundrymat and you're waiting for your clothes to dry or wash, whatever...and you see this man that resembles Richard Moore and you stare at him with wide eyes and almost ask him how Rachel's doing. (Trust me, I did see this guy that almost looked like Richard Moore..lol...seriously, I did..I didn't say anything...although I was about to!)
7)When you hear the name's Jimmy or Conan being mentioned whether you're with your family or with your friends, you automatically think of Jimmy Kudo and Conan Edogawa.
8) If you're ever forced to watch a Sherlock Holmes movie in class, you ask you teacher if it's like an episode of Case Closed.
9) You burn the samples of the Detective Conan songs you found onto a cd and you don't really care if they're samples or not.
10) When your friend(s) look through your CD's and they come across the Detective Conan CD, when they put it in the CD player and discover how many songs you have on it, they give you strange looks afterwards(Trust me...my friend saw my CD...which had over 75 minutes worth of Detective Conan music on it, she turned to look at me, and I just laughed at her expression!)
11) (From JouYasha ^-^) When you start solving cases in your dreams, or you start dreaming about the episodes of Case Closed. (Thank you, JouYasha!)

Well, that's all I came up with...if ya want me to add more, comment on this, and I'll edit it for ya! Until then, enjoy!