Two. 1 to screw it in, and 1 to complain that it's not dark enough.
A fish!
Two, two, two
None, cuz in the end it doesn't even matter!!!
Find out next time, on Dragonball Z!
A full set of teeth
About 1 in every 500 or 600 million have a chance at becoming human.
One does their chores while complaining, the other doesn't do them at all.
Two. One to screw it in and one to complain that it's electrified.