A: None-there weren't any light bulbs in the 13th century.
Zero. You can't fit a hairless ten-year-old inside a light bulb.
Silly, Muslim Women aren't allowed to screw in light bulbs.
A: Well first let's talk about the concept behind this whole "light bulb" thing.
None. Darkness foreverrrr!
Ayatollah you already !
Does it have to be a light bulb? I've got this neat candle holder...