Well, yeah. I'm sure at first it was just grunts and groans. Maybe some precursory head clubbing too.

What I find more interesting is when did we make the leap from grunts and groans, which is one thing, to a pre-defined set of letters that have certain sounds associated with them, certain glyphs, etc. That's when the real fun starts, when you can really start to make "proper" words (there are only so many things conveyable with grunts*).

Who "invented", say, the letter 'Z'? Why that particular shape for the letter? Somewhere, somehow, "cheese" came to be associated with this gone off milk. Why? What about the word "language?" There's a whole dictionary out there that needs explanation.

* One of them is defintely "go to the fridge and get me a beer, you overworked housewife", yes.