Gracie and the hot Bears

On the way to school this morning there was a hot air balloon visible in the sky. The girls loved it.

Gracie says: "How do the bears make it fly?"
Joe: "Bears?"
Gracie: "The bears in the balloon."
Joe: "What bears?"
Gracie: "The hot bears."
Joe: "What hot bears?"
Gracie: "You said it was a hot bear balloon."