Chicken Little, also known as Henny Penny and sometimes as Chicken Licken, is a European folk tale with a moral in the form of a cumulative tale about a chicken who believes the world is coming to an end. The phrase "The sky is falling!" featured prominently in the story, and has passed into the English language as a common idiom indicating a hysterical or mistaken belief that disaster is imminent. Versions of the story go back more than 25 centuries; it continues to be referred to in a variety of media.

Answer this question based on the passage: where did the sky is falling come from? OK. Let's think. My stream of consciousness:
The relevant information is: The phrase "The sky is falling!" featured prominently in the story, and has passed into the English language as a common idiom indicating a hysterical or mistaken belief that disaster is imminent. The answer is Chicken Little.