Klaus smiled. “I was puzzled for a long time,” he said, “but I finally thought to look at the list of ingredients. Listen to this: ‘Vinegar, mustard seed, salt, tumeric, the final quatrain of the eleventh stanza of “The Garden of Proserpine,” by Algernon Charles Swinburne, and calcium disodium, an allegedly natural preservative.’ A quatrain is four lines of a poem, and a stanza is another word for a verse. They hid a reference to a poem in the list of ingredients.”

Lemony Snicket, The Slippery Slope (241-42)