Deep thoughts

Last night, before Lill fell asleep, she and I had the following conversation:

LILLIAN: Mama, did you know that if you don't tell the truth and it's funny, then it's a joke.  And if you don't tell the truth and it's silly, then it's a trick.  And if you don't tell the truth and you can't prove it, then it's a lie.

ME: Who told you this?

LILLIAN: I just thinked it in my brain.