Two, but I don't know how they got in there.
Because hardly any of them know how to dance.
There are no nails, and no screws, it's all tongue and groove!
Three to screw it in and Bono to explain it to the world.
One. But he wishes it took two.
It's a secret!
Screw it. EDIT: has a better answer lol
Life's a bee-itch and then you die."
Doo-bees... I'm so sorry for that