What do I do? Trying to figure out my new biological abilities and then altering clothes. (If I had to pick a furry form, assuming we're also allowing non-mammals, I'd probably go with a dragon; if we had to go with real animals, a saber-toothed tiger; if they had to be non-extinct, some big cat or another.)
So yeah, I'd start by doing Science to it: do I have more strength, agility, balance, etc.? Does my diet have to change, or is this just an appearance thing? Do I still have opposable thumbs? How about my voice; can I talk? After determining all of this, I'd probably start checking the news and see that much of the world has had the same thing happen.
Now I start wondering who did it, but chances are I'm not going to find out because I'm not part of a government agency, so I'll keep up with the Internet and go about my business. I'd hope my boyfriend is okay being with me still, and I'd start sewing new pants for the tail I now have. Shoes would also need to be altered, but I expect there would be many stores cropping up for the sudden inrush of custom shoe orders. Alternatively, go barefoot where I can.
Then I'd have to break the news to my parents. "Hi, Mom, I'm half-cat now, don't worry about it, though." And I'm pretty sure that, because humanity is really freaking awesome at adapting, life would end up going on as normal. After all, even lottery winners tend to default to a certain state of happiness; we're very good at ignoring the weird and interesting stuff that happens in life once it becomes routine.
So yeah, I'd end up right back here at my computer, at work, filing my claws so they don't click so hard on my keys.
