"If there's a buzzing-noise, somebody's making a buzzing-noise, and the only reason for making a… — A.A. Milne

"If there's a buzzing-noise, somebody's making a buzzing-noise, and the only reason for making a buzzing-noise that I know of is because you're a bee."

Then he thought another long time, and said: "And the only reason for being a bee that I know of is making honey."

And then he got up, and said: "And the only reason for making honey is so I can eat it." So he began to climb the tree.

Source: Wikiquote · CC BY-SA 4.0