None. Racists dont like to be enlightened.
Two, but you have to get them in the lightbulb first.
By holding the bulb up to the socket and waiting for the world to revolve around them EDIT: Rip inbox EDIT 2: Thanks for the gold!
I would like to help with house #7.
German soldiers like to march in the shade.
None! We don't change light bulbs. We disrupt them.
NINE!
One to screw it in and nine to write on their blogs about how enlightening the experiment was.
None, they enlighten themselves.
A pilot, you racist.
A doctor, you racist!