I got it. But then, I am a physics geek.
How about these then:
How many radio astronomers does it take to change a lightbulb?
None - we’re not interested in that short wavelength stuff.
How many quantum physicists does it take to change a lightbulb ?
They can’t. If they know where the socket is, they cannot locate the new bulb
How many experimental particle physicists does it take to change a lightbulb?
How many politicians does it take to screw in a light bulb?
None… They’re all too busy screwing the public :smack:
How many psychiatrists does it take to change a lightbulb?
One. But the lightbulb has to really want to change!
These will probably work better/make more sense to the UK dopers…
(For the record IMO and from my experience the University of Bath one is worryingly accurate.)
And obviously no offence is meant by any of these jokes.
How Many Students Does It Take To Change A Light bulb At:
Aberystwyth: None - Most of them are still sleeping in the basketball
court following housing shortages.
St. Andrews: Three - One to call the butler and two to arrange a tailor
in Rome to design and make new suits for the special occasion. If a light
bulb in a major building blows then increase to 27 to allow for a brass band playing the last post and five Sun reporters. The following days Sun
will contain something along the lines of “Will’s Pals in Blown Bulb
Horror”.
Aston: None - And stay down, they shoot at the lights, that’s why the
last one went.
Bath: Seven - Five to form a radical new initiative called ‘TeamBulb’,
one to make a public announcement stating “A successful environment is not about pushing yourself to the absolute limit” and one to change the light
bulb before it’s actually blown.
Birmingham: Nine - One to steal a new bulb from the back of a shop, two
for the wheelmen and six to go shoot out all the light bulbs in some Aston student houses.
Cambridge: Three - one to mix the martinis, one to call the electrician
and one to call daddy to pay for the bill.
Cardiff/Caerdydd: Two- one to put the bulb in and one to hold an
umbrella.
However at least one native welsh speaker must be present to make sure that the english language isn’t dominant in the process of the change of the lightbulb.
Coventry: Two - One to take the bulb out and another to glass a random stranger’s face with it.
DeMontfort: Seven - Two to change the bulb and five to write an interpretive
modern drama about the experience.
Glasgow None of your f*cking business!
Imperial: Eight - It’s not that one isn’t smart enough to do it, it’s just that they’re all violently twitching from too much stress to achieve coordinated movement.
Keele: Fifty - one to change the bulb, 49 to stop the Stokie locals trying to steal the old bulb as “the next best thing” for their own houses.
Leeds: Three - One to change it and two to find a way to get high off
the old bulb.
Leicester: Four - One to change the bulb and three to complain bitterly that
it wouldn’t have been allowed to happen at Oxbridge, so please give us some
funding. Please.
Newcastle: Eight - One to find a red ‘Fireglow’ bulb, one to mount it
near the window and the other six to wait inside.
Oxford: An entire college house, but only one of them is sober enough
to figure out what to do with it, and he subsequently is cellophane-wrapped naked to a street lamp.
Oxford Brookes: Five - One to take the bulb out and four to stick their fingers
in the socket.
Paisley: Between three and ten, depending on how far through the term it
is, to club together their remaining funds to purchase a new light bulb.
Plymouth: Six - One to change it and five to campaign to make light
bulb changing a new degree subject.
Pontypridd: Ten - One to buy the light bulb and nine to petition for the
eventual electrification of Pontypridd.
Reading: Three - One to pull the bulb out and two to complain when the socket and ceiling come down with it through dry rot.
Sheffield: 51, one to change the bulb and 50 to sit around saying they
were well clever enough to change it but they couldn’t be bothered.
UCL: Two - One to change the bulb and the other to say loudly how he
did it as well as an Oxbridge student.
UMIST: Five - One to design a nuclear powered light bulb that never
needs changing, one to figure out how to power the rest of Greater Manchester using said light bulb, two to install it, and one to write the computer program that controls the wall switch.
UNL: Nobody Knows - The light bulbs stay with North London Uni longer
than the students.
UWIC: Only one, but he gets 10 course credits for doing it.
Warwick: Seventy Six - One to change the light bulb, fifty to protest
the light bulb’s right to not change, and twenty-five to hold a counter
protest allowing for permissible change in light bulbs, as long as the light
bulbs accept it.
York: Three - One to change the bulb and one to check his maths
coursework. 
How many folk musicians does it take to change a light bulb?
Three: One to change it, one to write a song about how much better the old bulb was, and one to complain loudly about light bulbs being electric.
This one just stolen from the James Randi Foundation website:
Q: How many homeopaths does it take to change a light bulb?
A: 0.0000000000000000000000000000000000001