Thanks!
I don't think the out loud or someone listening / reacting matters at all here. Suspect it's entirely this:
>The thought that was comfortable as a vague impression has to become a sentence, and sentences have structure.
I often construct full sentences in my head. And have conversations with my mental model of some other person. In full sentences Milton Love, a marine biologist at the University of California’s Marine Science Institute in Santa Barbara, Calif., says the fish's muppet-like appearance demonstrates "the awesome power of natural selection." ... "Or, and here is another hypothesis, Gaia created this fish after having one too many of those rum drinks that come with those little umbrellas."
Nice :-)