The White Rabbit
The White Rabbit was an artifact of the Amusement Park planet, a representation of a character from Lewis Carroll's Alice's Adventures in Wonderland. Although McCoy did not realize it until later, the rabbit was created in response to his thoughts about this story. The rabbit appeared before McCoy, commented that it was late, and then disappeared through a hedge. Moments later, a little girl appeared, asking a bemused McCoy whether he'd seen the rabbit.