There are hundred's of these things in circulation - as soon as there is a group of people, there will be a lightbulb joke assigned to them...
so here's a few for starters:
Q: How many surrealists does it take to change a lightbulb?
A: 2 - one to paint the giraffe green, and the other to get the bathtub out
Q: How many women with PMT does it take to change a lightbulb?
A: 5 - but don't ask me why - IT JUST DOES!!!
Q: How many management consultants does it take to change a lightbulb?
A: Well.. you only hire 1, but he comes in and asks "Why is the lightbulb being changed?" and sets out a plan for "Efficient lightbulb management" - you end up with a fee of £10,000 for a piece of paper which basically tells you to change the lightbulb when it stops working.