“Must a kettle boil?”
“Come oh come ye tea-thirsty restless ones -- the kettle boils, bubbles and sings, musically.”
“A man who wishes to make his way in life could do no better than go through the world with a boiling tea-kettle in his hand.”
“After some while Bilbo became impatient. "Well, what is it?" he said. "The answer's not a kettle boiling over, as you seem to think by the noise you are making.”
“Worry is like a kettle full of water, it felt as if my mind was on the boil at a ferocious intensity with no opportunity to let off steam. There is nothing you can do but get through it as best you can.”
“The Second Law of Pies: they must be baked, not fried (or boiled, or steamed).”