Just one, but it takes a really long time, and the lightbulb has to want to change...
None. They can't change anything.
A: Two. One to change it and one to sprinkle it with Parmesan.
Just one, but it takes 5 episodes.
Two. One to hold the light bulb and one to drink until the room spins.
Freud
The patients are the ones that get better and get to go home.
Long time, no see."
A log n truck.