Five. One to change the bulb and eleven to say they could do it faster.
or
Because all his other wives support Hillary.
or
Two. One to assure the everything possible is being done while the other screws the bulb into the water faucet.
or
One is a blood-sucking parasite, the other is an insect.
or
Five. One to screw it in and four to tell him how bitchin' he looked doing it.
or
Seven. One to change it and the other six to sing about how good the old one was.
or