Three. One to change it while the other two argue about how old the old one is.
None, because they keep on asking why all of the other light bulbs in the house aren't being changed at the same time.
Only one, but it take 4 episodes and Krilin died at the end.
None. According to Trump, they outsourced it to India & China.
I don't know, I am on hold.
Some old stuff just got dug up
Seven. One to install the bulb and six to figure out what to do with the old one for the next 10,000 years
5. 1 to screw in the light bulb, and 4 to remark on how grand the old one was.