Oh you, derpyhooves,
you're so random.
Great job on this flash, man. I particularly enjoyed the recreation of the scene from Feeling Pinkie Keen haha. (Yeah I'm a brony, wtf of it?)
Excellent animation; although in the beginning (where derpy was putting on the mail satchel and flying off), it seems like you were using drawing board animations, or unfinished products, to build the story up. I would have enjoyed a more energetic start.
Also, just before the title shows up, derpy's eyes are not derpy... I think it would have been hilarious, and accurate, for her eyes to be crossed just before the title (the beginning is fine, as it's just an opening, but as the title introduces itself, you should reveal her cross-eyedness).
9/10, 5/5