For the past few days, BB has been narrating a rather involved story. I think it's something she's made up -- the details she added today, at any rate, are clearly imaginary.
It started yesterday, when BJ was napping. BB wanted me to sit down on the floor next to her. "Mama! Sit down floor!" When I did, she started telling me about an ant. Using a combination of signs and words, she told me, "Ant dat way! Door!" I never found an ant, and (knock wood) we're not under invasion at the moment, but she was quite emphatic: an ant had been there, gone through the door into her room, and bonked its head.
Today, she told S the same story, adding the detail that it was a "big blue ant." I have no idea why!