Both should be changed regularly, and both for the same reason.
Just one, but they have to do it during dinner.
Me, and only me!
The letter F.
Just two. One to explain to the public that everything possible is being done to solve the problem, and the other to screw the lightbulb into the water faucet.
Because you have to change them.
So he could save his stool.
I dunno but it's probably the reason for their low birth rates.
They have no idea what 12 inches actually looks like. I for some reason could not find a way to phrase this any better. Credit to my coworker.