Russian Light Bulbs

Q: How many Russians does it take to change a light bulb?
A: That's a military secret.

Beverly Hills Residents to Change Lightbulb

Q: How many Beverly Hills residents does it take to screw in a lightbulb?
A: None, they have a service come in and do that.

Guitar Players to Change Lightbulb

Q: How many guitar players does it take to change a lightbulb?
A: Two: One to change the lightbulb, the other to say, "I can do that."