Okay so this one's kind of known where at the end of Pokemon the First Movie: Mewtwo Strikes back, did you know that when Ash is turned into stone and Misty is in the screen saying, "Please, no" (initially) that's where the creators were trying to figure out what she would say? So they thought of making her say either "Please, no" (initially like I said), "Pikachu, no" or a funnier one "My bike".