I hope I stole the idea to nobody
If you know the Princess and the Frog, you will understand why she is mad.
If you know the episode Power Ponies from the show, you know what will happen. If you don't, well : youtu.be/o2dMIuc9MqY
EDIT 04/03/13: Oh ! And I realized that I forgot a detail doing this picture. Here, HE is martyrizing a little harmless frog. So SHE is even MORE mad. So...
Fluttershy, My Little Pony : Friendship is Magic (c) Hasbro
Dr Facilier, the Princess and the Frog (c) Disney