Sometimes the sky glows red. It's an easily explainable occurrence, but Applejack doesn't know that. Fearing the worst for the town of Ponyville, and more importantly her harvest, she consults some friends who are knowledgeable on these subjects: the violet librarian with her nose in the books and the cyan pegasus that .... well, let's just say asking her something you don't know is a shot to the ego.