Should it really be a lightbulb
YOU'LL NEVER KNOW!! YOU WEREN'T THERE, MAN!!
About 8000
It takes two. One to change the bulb and the other to kick the switch.
One, but you can be sure a whole Reddit community will appear to expand the joke, make it funnier and eventually run it into the ground.
I've got this neat candle holder...
Should it really be a lightbulb?