Light Bulb - Manic Depressives

Q: How many manic-depressives does it take to change a light bulb?
A: Only one, but they keep changing it back and forth between the new and old bulbs.

Light Bulb - Tauruses

Q: How many Tauruses does it take to change a lightbulb?
A: One, but just *try* to convince them that the burnt out bulb is useless and should be thrown away.

Light Bulb - C++ Programmers

Q: How many C++ programmers does it take to change a light bulb?
A: You're still thinking procedurally. A properly designed light bulb object would inherit a change method from a generic light bulb class, so all you'd have to do is send a light bulb change message.