Q: What did the light bulb say to the fuse ?
A: That's a blow !
Q: How many women does it take to change a light bulb ?
A: None. "It's a man's job."
Q: How many light bulbs does it take to change a light bulb?
A: Two, the new one and the old one.
Q: How many 'real' programmers does it take to change a light bulb ?
A: None. 'Real' programmers prefer LEDs.
Q: How many Technical Support staff does it take to change a light bulb ?
A: "Well, we have an exact copy of your light bulb here and it seems to be working OK. Can you be more specific about the exact problem ?..."
A: I'm sorry, we don't support that kind of lighting technology.
Q: How many gas fitters does it take to change a light bulb ?
A: Three: One to turn up the day before when you're out, one to change the switch, and one to bring along the wrong kind of bulb.