All of them.
About seven. One to change the bulb, six to sing the song.
None. They aren't about to change a bulb when flipping a switch has worked for 15 years.
Only one, but an extra 15 to repost.
Five. One to handle the bulb and 4 to contemplate how David Sanborn would've done it.
Existence is futile.
Resistance if feudal