Just one, but it takes him 20 episodes.
They don't: They screw in a vacuum.
Two. 1 to screw it in, and 1 to complain that it's not dark enough.
One
3. One to change the bulb and two to talk about how beautiful the turns were.
There's 20 of them
21, the first 20 will just repost an old one.
20 Episodes and Krillin dies.
Just one. But it takes 20 episodes