Light Bulb - Publishers

Q: How many publishers does it take to screw in a light bulb?
A: Three. One to screw it in. Two to hold down the author.

Light Bulb - City Planners

Q: How many city planners does it take to screw in a light bulb?
A: Six - four to write an extensive study recommending a three-way 100/200/250 watt light bulb, one to write an article in the newspaper praising the study, and one to put in a 10 watt blub instead.

Elephant in the Dark

Q: How many elephants does it take to change a light bulb?
A: Don't be stupid, elephants can't change light bulbs.