Talk:Derpy/@comment-76.167.91.111-20120308044100/@comment-89234-20120308162611

I couldn't tell you which episode has that, but I do know that it was the fans who came up with Derpy being a mailmare in the first place. Any references to mail, delivery, or muffins (along with everything else about her) were integrated into the show as nods to the fans.