Don’t blink. Don’t turn your back. Don’t look away. AND DON’T BLINK!
On one of the Sarah jane Adventures episodes she goes back to the 1950s (for unimportant dramatic reasons) and spots a police box. She rushes towards it thinking it’s the Doctor - nope, just a police box. With a policeman in it.
Other things:
You can dig a tunnel to the center of the Earth and empty the Thames down it with no lasting consequences.
An exploding spaceship also killed off the dinosaurs.
You can move the entire planet to some other part of the universe and back without causing the Earth to disintegrate, the Moon to wander off on its own or all life to freeze to death. Your crockery may rattle a little, however.
Or, more recently, a Cardiff warehouse or laboratory.
(Since Torchwood is part of the Whoniverse…)
However, if you get this seemingly harmless, unarmed, and slightly rumpled fellow sufficiently pissed off he’ll engineer a temporal xeno-genocide that will result in your entire species having never existed. :eek:
Most people agree that your first one is the best one.
Are we referring here to William Hartnell or Rose? 
(And I cannot recall where I first saw this posted but: the Doctor’s Girls)
High technological gadgets of the far future will look, as Rose succinctly put it, “so disco.”
A perilous situation is always completely un-fixable, with no way out, no solution, no escape, no hope of rescue, no way to avert the truly terrible fate that awaits us, them or someone or something.
Until about six minutes from the end, when suddenly the way to stop it happening occurs to the Doctor or someone.
In other words, everything is strictly impossible until it suddenly becomes possible.
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(or whatever number we are on) Everyone (and pretty much everything) in the universe speaks English. I have tried using this rational on language instructors I have had, but it never seems to work.
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Anyone who dresses really badly doesn’t necessarily have bad taste, they could just be from a different planet and different time (This so explains Elvis’ jumpsuits and Elton John in general).
Er, no. The TARDIS translates everything - it’s been mentioned (and riffed on) several times, including the *Christmas Invasion *where it stops working for a while and the Pompeii episode where Donna attempts to speak Latin to a Roman to see what will happen (she gets accused of speaking Celtic IIRC).
The TARDIS always transports the Doctor to a critical or cataclysmic point in time. If the Doctor sightsees on Mars, it will be on the day the mars colony blows up.
I think they even discussed this in Doctor Who. There’s currents and eddies in time that the TARDIS locks on to. If you visit Shakespeare it will be on a critical day that the earth is nearly destroyed.
Nifty plot device. lol
Something absolutely completely totally really universally eliminated forever is gone for at least four episodes.
And if it’s gone considerably longer than that, you should be very, very worried.
Deadlock seals are bad news.
The current show’s TARDIS is nearly indestructible.
The TARDIS for the early Doctor(s) was very undependable. It often malfunctioned and took the Doctor to the wrong place.
Even Atila the Hun’s army couldnt get through! :smack:
Most alien planets look like a quarry.
Pssst…post 16
Every time the Daleks or the Cybermen are eliminated forever, expect them to show up in massive numbers next season or in the season finale.
Every Nuclear Weapon on Earth is secretly controlled by the UN or UNIT. Even North Koreas. As a Collary, the apperence of the UN being completely useless is just a very clever illusion.
Every other alien race in the universe either wants to destory or conquer the earth. The ones that don’t need us to reproduce.
Despite all of this, there are still people who don’t believe in aliens. Giant spaceships nearly destorying london on live TV notwithstanding.
Despite having a Machine that can go anywhere in time and space, the Doctor spends a suspiciously large amount of time in present-ish day britian.
No matter how far in the future you go, humans will always look the same(except for the ones that don’t look human) and technology won’t have advanced much. They will still be using diesel trucks at the end of the universe in a trillion years.
Most of Earth is England.