Because the Doctor's not from Mars.
Because his pockets are dimensionally transcendental.
Because he tells the TARDIS to 'behave!'
Because Donna is a pencil inside a mug.
Because 'with this ring, I thee bio-damp'.
Because Donna's yell can be heard over the noise of the TARDIS engines.
Because everyone knows you should never let a man with a sonic screwdriver near the sound system.
Because Martha doesn't believe he's an alien.
Because Martha FINALLY believes he's an alien.
Because 'Judoon platoon on the moon.'
Because he looks daft with one shoe.
Because she called him 'Doctor'.
Because Rose's name keeps him fighting.
Because he does a lot of reading.
Because 'to be or not to be' is a bit pretentious.
Because Martha won't step on any butterflies.
Because The Doctor cried when he read book 7.
Because the Doctor's upset Queen Elizabeth.
Because 'the play's the thing'.
Because David Tennant appears in Hamlet 2 years later. Fantastic!
Because the Doctor is completely insane, and a bit magnificent.
Because he 'doesn't want to go home'.
Because he is not alone.
Because it's spelt with three L's and an H.
Because my angel put the devil in me.
Because the Doctor's a hot potato in a sharp suit.
Because he has to pick it up.
Because the Daleks are such gossips.
Because there should be a spin-off called The Pig and the Showgirl.
Because of the 'odd pig-slave-Dalek-mutant-hybrid'.
Because his tux is unlucky, and a bit James Bond.
Because it's 'always the mothers'.
Because the Doctor loves nibbles.
Because he knows his Eliot.
Because he can play the organ.
Because there are at least 52 settings in his screwdriver.
Because the Doctor likes the term 'science geek'.
Because no one knows who Harold Saxon is...
Because he's scared, Martha. He's so scared.
Because the sun is alive.
Because no one teaches recreational mathematics anymore.
Because the Doctor loves a good stasis chamber.
Because 'here comes the sun'.
Because who is Harold Saxon?
Because that's him. Completely human.
Because we already knew that bow ties were cool.
Because he can draw.
Because Gallifrey must be in Ireland.
Because 'I HATE PEARS!'
Because they shouldn't have let him push all those buttons.
Because he's wonderful.
Because John Smith dreamt of a blue box.
Because of the wibbly wobbly timey wimey... stuff.
Because it's perfectly simple - if you blink, you die.
Because sadness is happiness for deep people.
Because every single Doctor Who fan wants 'The Angels have the Phonebox' on a t-shirt.
Because he and Martha saw the moon landing four times.
Because the Weeping Angels kill you 'nicely'.
Because his timey wimey detector goes 'ding' when there's stuff.
Because you should nod when he stops for breath.
Because it's not pretty when they blow.
Because Jack can't say hello to anyone.
Because Martha and Chan'tho don't mind.
Because the TARDIS is the sportscar of time travel.
Because the Doctor's new regeneration's kinda cheeky.
Because, the Master's testing out his new voice.
Because the Doctor invented 'Hermits United'.
Because every single person watching when the Master announced himself went 'NOOOOOOO WAAAAAY!!'. Don't deny it. I know you did.
Because of the gas.
Because what this country really needs, right now is a Doctor.
Because funny is like this...
And because not funny is like this....
Right now he's not like...
Because the Teletubbies are an excellent example of evolution.
Because what are grits, anyway?
Because the Doctor forgave him. Of course he did.
Because he never could resist a ticking clock.
Because that's the last time Jack books his hotel over the internet.
Because what happens if he lives to be a million years?
Because they called him the FACE OF BOE.