Wonder where she's heard this?

[Addi and Libby cleaning up after I let them play "office" - pull out all our surplus office supplies, throw them on the kitchen table and let their little imaginations go to town]

Addi: Libby you are not helping me clean up!

Libby: YES, I am!

Addi: No, you're not! Do you want me to tell Mommy and get you in the doghouse?!