Four, one to change it and three to comment on the changing.
Why NONE of course, they prefer to remain in the dark!
Just one, but first they have to sit in the dark for a year and then get letters from two electricians giving them permission.
Probably one but you can't generalise.
Define "light bulb".
Because they can't deny that their comment was the parent.
Answer in comments
It's a Moray."
