Only one... but it will take a few episodes. The lightbulb saga
Just one, but the light bulb is going to need to change itself.
Who wants to know
They don't change it, they just take forever to find where to fit the batteries
One, but it takes at least three light bulbs.
Just one. But it takes five episodes.
Just 1, but It'll take 7 episodes for him to do it.