You know you're a Whovian when...
-You claim that bananas are a 'good source of potassium' and tell people that you should always bring them to parties.
-When people ask if anyone you know has died, you tell them that you knew people named Rose...and Amy...and Rory...
-Whenever you listen to a song, you automatically find a Doctor Who meaning for it.
-You slip Doctor Who references into your speech.
-And get mad when no one recognises them.
-You've developed a habit of rambling, just like the Doctor.
-The excuse for why you've not turned your homework in is always something to do with time travel.
-You're attempting to build a TARDIS in your garage.
-You keep telling people about all the people you've met in your travels in Time and Space.
-You cried at the end of Doomsday, Journey's End, and Angels Take Manhattan.
-If you have a favorite companion... you defend him/her viciously on forums and in discussions.
-You keep badgering your friends/family/classmates/teachers/complete strangers to watch the show.
-You have a shirt that says 'Wibbly-wobbly-timey-wimey stuff' on it.
-You actually did a search on Google for 'doctor blue box'.
-'Run' is something you yell all the time.
-Bonus points if you have ever said to someone, "Hello -insert name here-, I'm -insert name here-. Run for your life!"
-You think bow ties are cool.
-And fezzes.
-And stetsons.
-And various other things.
-If something is 'bigger on the inside', you yell that out as loudly as you can.
-You've considered ways to fix an episode you didn't like the end to, e.g., 'Journey's End'.
-You're planning on naming your kid after a companion.
-Or naming them 'John Smith'.
-Or 'The Doctor'.
-You've read Doctor Who fanfiction.
-Bonus points if you've cried whilst reading one.
-Bonus points if you actually WROTE one.
-Even more bonus points if it's a crossover.
-You've woken up in the middle of the night...and gone to the toilet/to get a drink... and you thought you saw a Weeping Angel.
-You have a favorite type of Dalek.
-You own a type of Sonic Screwdriver.
-Bonus points if you've ever gone into a public place and scanned the area with it.
-You've attempted to use the same sonic screwdriver on wood...and you yelled out how annoying it was when it didn't work.
-You're able to have long, detailed, philosophical discussions about Doctor Who.
-You think that the fact you have to wait a WHOLE EXTRA DAY before you see the new episode is a crime worthy of capital punishment.
-You once attempted to write an episode.
-You've played Weeping Angel Tag.
-You can mimic River Song saying 'Hello, sweetie' and 'spoilers, sweetie' flawlessly.
-'Fantastic' has just about become your official catchphrase.
-You keep a spot in your garden cleared for the TARDIS...just in case.
-When you ship...you ship HARD.
-Bonus points if that ship is Doctor/Rose. Just because.
-You can mimic a Dalek voice perfectly.
-And a Cyberman voice.
-You can say 'Raxacoricofallapatorius' easily.
-Bonus points if it took you hours of practise.
-You can actually name the times that Sarah-Jane was possessed/hypnotised.
-You dressed up as the Doctor for Halloween.
-You dressed up as a companion for Halloween.
-You dressed up as a monster/alien for Halloween.
-You actually managed to dress up as all three. At once.
-You've graffitied 'Bad Wolf' somewhere.
-You regularly go on Doctor Who-inspired adventures with your sibling as your companion.
-The creepiest episode, in your opinion, was Midnight.
-You have made a timey-wimey detector, and declared it goes 'bing' when there's stuff.
-The best episode, in your opinion, was one of the season finales.
-You have used one or more of the following as an alias: Rose Tyler, Donna Noble, Martha Jones, Amy Pond/Williams, Melody Malone, Idris, The Doctor.
-AND THE ONE SURE-FIRE WAY TO TELL IF YOU ARE A WHOVIAN:
You can flawlessly quote an entire episode. From memory.

I spent half an hour composing that, and did not steal from any web sites. I haven't actually seen any websites with this on, or any fanfictions. This is my original- !
So. Got any more...?