You decide to go into one of the animal doors. Since snakes are your favorite animal, you go in that one. The room looks like a snake habitat is the zoo, with all sorts of tropical plants and trees. You walk around for a wile and don't see any snakes, so you decide to head back, when your legs feel weird, so you lowered your pants.
Your legs are completely covered in scales! You feel them, and have the weirdest sensation in your life. You start to wonder what's going on, when you notice your toes were being pulled in! "Oh!" you exclaim as you realize what's going on. Your lower half is going to turn into that of a snake!
You make a break for the exit, because if you get out, it might reverse the process. You suddenly stumble, and look at your legs. They are fusing together, form the top down. You have to wait until they finish fusing. After a wile you are able to get up and you feel your canine teeth lengthen into fangs, and your tongue splits in two at the tip.
You slither around for a while, and have the weirdest sensation ever. You decide to see what snake your lower half is, so you turn around, and your eyes widen at what it is...