You Can't Argue With Her Logic

Bathtime: Mommy sets Fiona up with washcloth and soap and tells her she'll be back when Fiona's done washing her body so that Mommy can wash her hair. After about 30 seconds:

Fiona: I'm done with my arm!
Mommy: You still have to do the rest of you.
Fiona: No.
Mommy: Yes.
Fiona: I don't want to.
Mommy: Well, you're a big girl, you can do it.
Fiona: Well, you're a bigger girl, you can do it.

Touché.