Seven. One to install the new bulb and six to figure out what to do with the old one for the next 10,000 years.
or
Because all his other wives support Hillary.
or
Fish and ships.
or
Bozo The Clown has real hair on his head.
or
1,000,001: One to change the bulb and 1,000,000 to rebuild civilization to the point where they need light bulbs again.
or
Two. One to take out the bulb and drop it, and the other to try and sell it before it crashes.
or
1,000,001: One to change the bulb and 1,000,000 to rebuild civilization to the point where they need light bulbs again.
or