"You've Finally Lost it."

That's what my sister told me today while I was practicing my piano. Apparently I talk to myself?? I only said something like, "Oh okay, hmm.." when I figured out how to play something! But what I realized is that writers do talk to themselves. I mean, they probably brainstorm about things in their head..and sometimes they end up saying it out loud? At least that's what I do, but it makes sense.