Duh

kid: If you want to be a really good artist, like, show your artwork in a museum, you have to work slow as a snail.

me: Not necessarily. Pablo Picasso painted quickly sometimes. That's how he was able to make so many pieces of art.

kid: Well, that's because he has eight arms!

me: Haha, what? Where is this information coming from?

kid: From imagination, duh!