None. Bill Gates will just redefine Darkness® as the industry standard.
or
She kept running away from the ball.
or
Do you swear to pull the tooth, the whole tooth and nothing but the tooth?
or
None. Agnostics question whether electricity really exists.
or
Just one, provided there is a programmer around to explain how to do it.
or
I mean he did say he was a private tutor.
or