A conversation...

Me: Let's sit on the potty.
Lana: No.
Me: Why don't you want to sit on the potty? Mommy sits on the potty.
Lana: Mommy has a big bum. Lana has small bum. It's a big potty, Lana is small.
Me: If I get you a small potty will you sit on it?
Lana: No.
Me: Why not?
Lana: I'm playing puzzles.