1. It could be racist because you'd be equating Asian culture (unfortunately I cannot remember which country and I don't feel like looking it up so I'm just generalizing it to Asian) with cartoon silliness.
2. Pretty sure you're the first, but not sure why, because this is fucking genius.
3. Better, because then they are a willing participant, as opposed to just listening to you do it with nothing they could do about it other than risk losing a fare.
4. You've stumped me.