Polite as a Princess

As bedtime approaches, we tell Fiona it's time to brush her teeth. Daddy starts toward the bathroom with his daughter.

Fiona: I can do it myself!
Daddy: (knowing the relation of the medicine cabinet to the height of a four year old) Let me just get the toothpaste down for you.
Fiona: Okay.

Daddy retrieves the toothpaste and, after some back-and-forth deliberation, leaves it in a spot that is almost-but-not-quite out of reach so that Fiona can expend the maximum effort she demands.

Fiona: Now go away.
Daddy: That's not a very nice way to talk.
Fiona: (vocal tone unchanged) Please go away.