This is one of the best "lightbulb" jokes I have ever read:
How many members of your sign does it take to change a light bulb?
ARIES: Just one. You want to make something of it?
TAURUS: One, but just try to convince them that the burned-out bulb is useless and should be thrown away.
GEMINI: Two, but the job never gets done - they just keep discussing who is supposed to do it and how it's supposed to be done!
CANCER: Just one. But it takes a therapist three years to help them through the grieving process.
LEO: Leos don't change light bulbs, although sometimes their agent will get a Virgo in to do the job for them while they're out.
VIRGO: Approximately 1.000000 with an error of +/- 1 millionth.
LIBRA: Er, two. Or maybe one. No, on second thought, make that two. Is that OK with you?
SCORPIO: That information is strictly secret and shared only with the Enlightened Ones in the Star Chamber of the Ancient Hierarchical Order.
SAGITTARIUS: The sun is shining, the day is young, we've got our whole lives ahead of us, and you're inside worrying about a stupid burned-out light bulb?
CAPRICORN: I don't waste my time with these childish jokes.
AQUARIUS: Well, you have to remember that everything is energy, so....
PISCES: Light bulb? What light bulb?