Should I Be Concerned?

Dinner time. Anna is fidgeting like crazy. I am sure she is going to fall off of her chair.
I ask her what's going on. Does something hurt?

"No Mommy, there's just music in my head and it's makin' me shake!"
Hmmmn. I have no idea how to respond to this.

And then out comes the most rousing rendition of Ba Ba Black Sheep I have ever heard.
(And let me tell you: I have attended a lot of preschooler music classes.)

A different dinner time. Anna is finishing her dinner.
Anna is thinking. And then:
"Mommy, my tummy is REALLY big and I just heard a 'Neigh'!"
[from inside of it]

Have I mentioned that Anna really, really wants a horse?