You step out of the tunnel, and find yourself in small, grassy enclosure. People are all around the outside of the fence, smiling at you and waving. Some take photos. There is a huge horse standing next to you - her scent is strong in your nostrils, and she makes you feel safe and happy. She? You can see her belly, and find that it is indeed a mare, with swollen teats.
The sight of her full udder makes you very hungry, and you move close and lip at one of the black teats. Instincts kick in and you begin to nurse. Although it is hard to concentrate on anything else, you hear a woman's voice close by.
"For those of you who just got here, this handsome little fellow having breakfast is Duke. Just 4 weeks old, and you can see how big he is already. He has classic markings, and perfect conformation. We're expecting him to be one of the nicest Clydesdales we've ever had here at Busch Gardens. Most of our males are gelded, but there's a good chance Duke will grow up to be a stallion."
The part of your mind not preoccupied with nursing realizes that you are Duke! The mirror turned you into a Clydesdale colt!