From Antick Musings, publishing light-bulb jokes: A few samples:

Q. How many copyeditors does it take to change a lightbulb?
A. The last time this question was asked, it involved art directors. Is the difference intentional? Should one or the other instance be changed? It seems inconsistent.

Q. How many publishers does it take to screw in a lightbulb?
A. Three. One to screw it in, two to hold down the author.

What are your favorite lightbulb jokes?