Just one. To threaten suicide if you don't change it for him/her.
None: Arians aren't afraid of the dark.
Two. One to actually do it, the other to film it so fundamentalists won't claim that God did it.
Why would a blind man need a light bulb?
Ten: one to screw it in and nine to say, "Pssh, I can do that."
Only one but it may take him/her more than five years to do it.
