None. Agnostics question whether electricity really exists.
or
Because all the fans left!
or
Seven. One to change it and the other six to sing about how good the old one was.
or
Two… one to tell the engineer to do it, the other to say "I don't know, what do you think?"
or
Because there's no one else to wag it for him.
or
if you mess with the United States, there will be hell toupee."
or