Madeline taking discipline

On our evening walk to the park, Madeline had a tough time sitting nicely in her stroller. Here's the dialogue at the end of the walk:

Big Daddy: Madeline, you need to be a good listener. Mommy said to sit down nicely.
Madeline: Daddy, I am a listener.
Big Daddy: If you don't sit down, I am going to give you a spanking on your butt.
Madeline: No, Daddy, it's your bottom.

As you can see, she was really shaking in her pants at our best efforts of being firm.