Two. One to assume the ladder and one to change the bulb.
A': None. If the government would just leave it alone, it would screw itself in.
or
I just found the Bush that Jeb lost."
or
Well, first let's talk about the concept behind this whole "light bulb" thing.
or
Because he wanted sweet dreams.
or
Bike helmets don't fit hippos
or
Because all the fans left!
or