How many maintenance programmers does it take to change a light bulb?
None. They try to fix the old one.
"We looked at the light fixture and decided there's no point trying to maintain it. We're going to rewrite it from scratch. Could you wait two months?"

How many software testers does it take to change a light bulb?
None. "We just recognized darkness, fixing it is someone else's problem."

How many C++ programmers does it take to change a light bulb?
"You're still thinking procedurally! A properly designed light bulb object would inherit a change method from a generic light bulb class!"

How many Java programmers does it take to change a light bulb?
One, to generate a "ChangeLightBulb" event to the socket.

How many Windows programmers does it take to change a light bulb?
Seventy two. One to write WinGetLightBulbHandle, one to write WinQueryStatusLightBulb, one to write WinGetLightSwitchHandle...

How many data base people does it take to change a light bulb?
Three: One to write the light bulb removal program, one to write the light bulb insertion program, and one to act as a light bulb administrator to make sure nobody else tries to change the light bulb at the same time. 

How many technical writers does it take to change a light bulb?
Just one, provided there's a programmer around to explain how to do it