Light Bulb - Proofreaders

Q: How many proofreaders does it take to change a light bulb?
A: Proofreaders aren't supposed to change light bulbs. They should just query them.

Deconstructionists to Screw in Lightbulb

Q: How many deconstructionists does it take to screw in a light bulb?
A: It doesn't matter. Even if the bulb is screwed in, it will always be flickering, however faintly, so it really hasn't worked. It is incapable of delivering uninterrupted light.

Light Bulb - Serbs

Q: How many Serbs does it take to screw in a light bulb?
A: Two--one to shoot the old bulb out and one to screw the new one in.