Q: How many Librans does it take to change a lightbulb?

1: Er, two. Or maybe one. No --- on second thoughts, make that two. Is that okay with you?

2: Why change the bulb? Isn't it more romantic in the dark?

3: Well gee, I don't know really. I guess it depends on the bulb and where it burned out. It might perhaps take just one if it's just an ordinary bulb, but maybe two if the person doesn't know where to find a new light bulb, or perhaps ...