When you depend too much on Derpy, she eats chocolate. When she eats chocolate, the party shop floats in the sky. When the party shop floats in the sky, party supplies begin raining from the sky. When party supplies start raining from the sky, ponies panic in fear and joy. When ponies start panicking in fear and joy, Ponyville falls into chaos. When Ponyville falls into chaos, ponies are set on fire.