He was in shock for a week.
or
Two, one to call the electrician, and one to mix the drinks.
or
Only one, but the bulb has got to really WANT to change.
or
None: A `Real Woman' would have plenty of real men around to do it.
or
Plane ones.
or
Bike helmets don't fit hippos
or
"Ten billion dollars and high cholesterol!"
or