Derpy Hooves is having a really tough day - first she breaks Ponyville Town Hall, then her Boss makes her mail route all windy, and then she has to go all the way to Marelin! Even her muffins seem to hate her!
Can she get through the day with her spirits up, like the Derpy we know and love?

Cover Art: Today's Last Delivery, by Kiyoshii, at DeviantArt.