Four. One to change the bulb and three to whine "It's too high"
or
None. The darkness will cause the bulb to change by itself.
or
6: 2 to screw in the bulb and 4 to testify that it was lit from the moment they began screwing.
or
I just found the Bush that Jeb lost."
or
Two, one to call the electrician, and one to mix the drinks.
or
but I couldn't find any.
or
The lettuce came in ahead, the egg got beat and the faucet is still running.
or