None. Real Men aren't afraid of the dark.
or
Just one more, guys, I promise.
or
Only one. They don't like to share the spotlight.
or
None. The light bulb contains the seeds of its own revolution.
or
Actually, agents will screw in just about anything.
or
Two — one to screw it most of the way in and the other to give it a surprise twist at the end.
or
What does it matter? we're all gonna die anyway.
or
None. Bill Gates will just redefine Darkness® as the industry standard.
or
``Twelve. Ya got a problem with that?''
or
``Oh wow, is it like dark, man?''
or