Logo-less version of Rage Pony (http://youtu.be/n-pb-xqStLY).

I still can't decide whether announcing Pound Puppies or Applejack shirking her responsibilities makes Pinkie enrage the most.

"My Little Pony: Friendship is Magic" © Hasbro

EDIT: Now enhanced with loop. Enjoy your endless FFFFFUUUUUUUU...
---
Applejack is the last feather breaking the pony's back.