Just one. To threaten suicide if you don't change it for him/her.
One to screw it in and nine to write on their blogs about how enlightening the experiment was.
Trick question, anarchists can't change anything.
Just two. One to politely ask and the other to politely help.
None - because they would all be replaced by white actors.
One to change the lightbulb and one to drive down to Kent to pick him/her up.
