I love Facebook's On This Day feature, since I get to relive all the cute things my kid said. Here's an antonymous one that didn't make it into the last list. She was 3.
Grover: Why did M's mummy say that [M had to do something]?
Me: Because mummies know what's good.
Grover: And childrens know what's bad.
Grover: Why did M's mummy say that [M had to do something]?
Me: Because mummies know what's good.
Grover: And childrens know what's bad.