Just one, but they have to steal it first.
How many data wranglers does it take to change a lightbulb? Just one, but they need a backup.
One. They stick the bulb in the socket and wait for the world to revolve around them!
This is a joke I came up with. Q: How many religious people does it take to change a light bulb? A: There's no need to change it when you can easily convince everyone that it still works, but they've gone blind.
Nein!
Because they keep stealing all the green cards.
Because the label said, "Contents Under Pressure" Got this joke from my brother :D