Twilight had just moved to Ponyville a few weeks ago. Where Canterlot was primarily unicorns, Ponyville was a plethora paired with a floating city filled with pegasi, but then something catches her eye when she looks at the recent weather report and sees a brown cloud with the name 'Chocolate Rain' and goes to ask Rainbow Dash what it means.
She doesn't like the answer she's given.
Based on a request by Perfectly Insane relative to an old tweet by Faust.