You feel a cramping feeling in your chest, hands and feet. Then there are sharp pains on the top of your skull. You look at your reflection in the mirror as your eyes tear up from the pain. Your Santa suit is shrinking away to form a harness and expose your naked skin. As the rubber recedes to form the harness, your exposed skin tingles and begins to sprout dense hairs. Your hands are crippled in odd shape. Large mounds are rising from either side on your head. They erupt to rapidly grow into huge velvety antlers. You snort and leap across the room to where Santa Claus is still standing. You seem to fly and land surprisingly gently. You drop to your knees as a human-deer hybrid pleading for Santa's mercy.
"Oh, come now!" Santa laughs, "You knew you were naughty. Did you really think I'd give you a present? No, one of my reindeer died on the hotel room. Chewed on an electrical wire," he shook his head, "Anyway, since my reindeer aren't immortal like me, I use the naughty list to replace them. And you were the naughtiest one in this building. I must say I was surprised by your gift. The box was empty when I handed it to you. It reads your inner desires to create a costume that you'll put on. I guess I should be flattered that you wanted a Santa sex suit." He shook his head again. "Well, we have plenty more toys to deliver."
He grabs the lead on your harness and guides you toward the mouth of the fireplace. He puts his finger on the side of his nose, nods, and everything goes dark and blurry. Next thing you know you are on the hotel roof, harnessed in line with the other reindeer.
"Now I know it may seem impersonal, but I've been doing this for years, and it's easier just to transform each naughty fellow into the reindeer that he's replacing. So from now on you're..."