A young, poor boy approaches a cheesemaker.
"Sir, I am very hungry. I am willing to clean your entire cheese shop for a pound of cheddar. "
The cheesemaker thinks for a moment, decides, and nods. "Forthwith!"
The little boy grabs a broom and vigilantly begins cleaning.
At the end of the day, the little boy shows the cheesemaker his fine work. The cheesemaker, approving of the poor boy's efforts, hands him a pound of Swiss cheese.
"But I said I would clean your shop for a pound of cheddar!" protested the boy.
And the cheesemaker replies, "And I thaid for thwith."