mermaid...
So when River was taking a bath tonight she got up and sat on the edge with her feet in the water and put her head down and started mumbling sadly, and then got in the water and yelled, "Yay! I'm a mermaid!". When the exact same thing happened a minute later, I asked what she was mumbling, and she said it again, louder while shaking her head sadly, "I know I can be a mermaid..." then proceeded to get in the water quickly and again yell, "Yay! I'm a mermaid!".