Just two, but you're going to need a lot of patience and light bulbs.
None, the room is already lit.
Only two, but you've got to wonder how they climbed up there!
Two. Obviously.
None - the lightbulb has the capacity for its own revolution
Two, one to change the lightbulb, and the other to bask in the light of the old one.
The stone to throw the lights out, the flashlight to check if the lights are really out
None. Babies don't have the motor skills or the depth perception to change a light bulb.
Why does it have to be a group activity
You need to keep them in a safe space if you don't want them triggered.
Because he needed a crap.
One is a brick and the other is a brick with a screen
Lots
They have a lot of moo/neigh.
He lost his patience