Light Bulb - Macintosh Engineers

Q: How many Macintosh engineers does it take to screw in a light bulb?
A: None - it has to be done by a local authorized dealer.

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.

Elephants to Change Lightbulb

Q: How many elephants does it take to change a lightbulb?
A: Two, but it has to be a pretty big light bulb!