Okay, so this is totally taken from the Time and Chips community post, but here goes:
1. You say “Fantastic” all the time.
2. You see nothing wrong with spending over five hours searching for “Doctor Who” fanfics.
3. You beg your granny to teach you how to knit and make a long, multi-coloured scarf, ala the Fourth Doctor / Rose in “Boom Town”.
4. You spend hours trawling through fanfiction just to save them all on your favourites... and you have at least a hundred of them. Filed meticulously under 'Fanfiction', under 'Doctor Who'. And that's just the Rose/Doctor shippy ones.
5. You begin to fantasize about the Doctor during Maths when the teacher is droning on about simultaneous equations... uncaring that the reasonably fit lad next to you just revealed inches of his abdomen. If it isn't the Doctor’s, you just don't want to know.
6. You fake illnesses just to hear people say; "You should really go to the Doctor’s." Upon hearing this, you may or may not experience a light feeling of... ahem, release.
7. You shut yourself in the bathroom away from the computer in order to force yourself to finish the homework due in tomorrow. Which you end up rushing and messing up anyway in order to catch more drabbles. NOTHING will drag you away from the computer - not even sunlight or food.
8. Your mobile has a picture of a 1950's/60's blue police box as someone’s display photo. Said number is stored under the name TARDIS. Said person is not surprised when they are greeted by a scream of delight and joy as you hope it's the Doctor inviting you round to 'pull his lever'.
9. You watch Doctor Who reruns so many times, you are able to produce pages and pages of analysis on the facial expressions of all the characters. This look is saying "Take me now!!” That look is a "I want to punch him because he is taking a bit too much of an interest in you" look.
10. Your 'Pictures' files are starting to look suspiciously jammed with wallpapers of the Doctor and Rose, the Doctor, Rose, the Doctor with digitally removed jacket and top and pants and...
11. You have an overwhelming feeling of sympathy for giant pepper pots that have been tortured painfully and want to kill everyone, but then become confused with feelings and ship certain relationships.
12. You have the days, hours, minutes and seconds being counted down until the next episode. Nanoseconds may or may not be included in this.
13. Words like 'Hand Porn' 'Shipper!Dalek' 'Pink Shawl' and 'Tea Room' make sense and are becoming part of your everyday vocabulary- to the confusion of your unenlightened friends.
14. Nothing makes you happier than hearing the opening ‘wooooooEEEEEEEEoooooooo' music, and you sing said music absent-mindedly, much to the chagrin of everyone nearby.
15. You compulsively refresh the Time & Chips homepage for updates.
16. You secretively write fanfic in your little corner at work/school and quickly flip to another window on the computer whenever someone comes over to the printer to get something.
17. You re-arrange your whole Saturday so you can be in front of the TV at 7.
18. Someone walks past with a plunger and you can’t stop laughing.
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19. You dance insanely round the room when anything Doctor Who related appears.
20. You find yourself turning almost every conversation to Doctor Who related matters (at least in your head).
21. You can't eat after 6:30 on a Saturday as you're sick with anticipation.
22. You are plagued by plot bunnies which keep you awake.
23. You write endless Doctor Who fanfic.
24. You keep accidentally writing 'Bad Wolf' on your lecture notes/in the bathroom mirror/in alphabet spaghetti as you muse on what it might be.
25. A sonic screwdriver is already on your Christmas/Birthday list.
26. You start dreaming entire episodes.
27. You get most of the good dialogue for your fanfics by having 'conversations' between the Doctor and Rose whilst the shower.
28. Hand holding has a whole new meaning.
29. You count down the minutes to a new ep.
30. You have butterflies in your stomach before an episode airs.
31. A man taking his jacket off has never seemed so sexy...
32. You physically berate Dead Ringers for getting the accent wrong.
33. You can't actually remember what you used to do on Saturday nights.
34. You're in your local clothes shop and eye the plastic dummies suspiciously - just in case.
35. You buy the entire series of Linda Green on DVD - because Christopher Eccleston is in one episode.
36. You hear Glen Miller playing in Woolworths and run back thinking "Oh My God!!! They're showing “The Empty Child”!" only to find out it's a random "romantic moods" CD and loads of people are staring at you.
37. You can’t listen to run by snow patrol without thinking about rose and the doctor and/or crying.
38. Everything you do has connotations of the show.
39. You consider going to the pet shop to buy some fish and call them Chris and Billie
40. Suddenly people are avoiding you in case you corner them and subject them to an hour long lecture on the merits of the show.
41. Someone wakes you up in the middle of the night and you start muttering about doctor who
42. You go into a charity shop to look at their paperbacks and find yourself debating over whether or not to buy a single of Billie Piper's.
43. You have a strange desire to go around defacing public property with the words "Bad Wolf".
44. You look at a painting of a rose dancing on a bridge and go crazy
45. You freak out whenever there’s a light breeze and/or you hear a ‘whooshing’ sound
46. Your heart skips a beat whenever you hear the word ‘doctor’
47. When you’re at a science and technology master-class day and the boys in your group make a couple of completely crap models of daleks and you insist on taking them home and giving them pride of place on your shelf.
48. You write ‘I hate Lynda’ and ‘number 9 will forever be my doctor’ all over your diary and pencil case.
49. You spend hours on doctor who fan forums and livejornals nicking their fanfics and icons.
50. You get really pissed off when someone calls the doctor ‘doctor who’
51. You print off the lyrics to a song and right down all the ways they are related to doctor who
52. You wonder why you ever hated Billie piper
53. You say ‘fantastic’ at least 10 times a day
54. Chips suddenly seem more appealing.
55. So do bananas.
56. You want to go to central London just to show everyone exactly where the TARDIS landed on Victoria embankment
57. You have a urge to run across Westminster bridge
58. You can say and spell the planet the slitheens come from
59. You constantly quote from doctor who, sometimes without even realising, even in papers for classes
60. You wear black for a week after the last episode where the doctor died
61. You sit down and type up a list of signs that someone is obsessed with doctor who
62. You look through magazines and TV guides desperately looking for pictures of Chris, Billie, john, or anything else related to doctor who.
63. You’re life suddenly seems meaningless.