Only one... but it takes a shitload of light bulbs.
Two. One to hold the bulb, and another to spin the story until the bulb fits.
Only 1, but it takes them 15 episodes to do it.
A: None! If you'd just make it a day exterior we wouldn't be screwing around with all these damn light bulbs!"
5,6,7,8.
What did one ape say to the other ape. "
I can't help it - she brings out the beast in me!