While changing baby Thalia's diaper for the nth time today, I turn to Sophia for assistance:
Me: Could you get me another plastic bag for the baby's dirty diaper?
S: No, I'm tired of doing that. (she slips away)
Laura: Did she just walk away?! Sophia! Daddy needs your help! (silence)
Me: Sophia! Don't you want to help me change your sister's diaper?
S: No!...
(Hmm, I can't imagine why not...)