Your stomach begins to inflate. Not from the back, though, just the front. You lift off your shirt to reveal a large... udder. A cow's udder. And that certainly isn't part of the male bovine's anatomy.
The crowd walking past look in in awe. A tour guide stands at the side explaining what has happened to you. "What you are watching, ladies and gentleman, is the progression from human male to bovine female! Never performed before!"
CRAP. What are you going to do?! Then, the man who brought you out here comes through and rips off your clothes. You are now sitting completely naked in a pile of hay. He also brings out a middle aged man, who now has boar tusks. He is sitting similiarly nude, although he is panicking over all this more than you.
Your face then morphs into that of a cow's; two small ears appear at the top of your head, and you now have a large, wet muzzle. You have kept your hair, despite the apparent sex change.
Your skin changes into a soft white fur, covered in black patches. You get up and try to run, but your feet turn to hooves, followed by your hands. You wonder whether it may be an idea to walk on all fours, but your skeletal structure doesn't appear to be changing very much.
You grow a tail from behind, and then, you notice the changes...