Hmm, I have an alternate theory for this one:





Fluttershy ordered this carrot cake for an outing she was having with her bunny friends. However at some point while the order was being prepared Pinkie Pie reached the conclusion that she wanted some of the cake as well and, though she managed to refrain from eating it in the bakery, could no get the thought out of her head. Then she came out with the perfect solution: if she could become a rabbit for the day she could have her cake without changing Fluttershy's bunny picnic. Though Twilight was doubtful of Pinkie's solution she eventually gave in just as Pinkie knew she would; after all who would question the sudden appearance of a pink bunny?