how do i make people talk

i don't have unity (yet) but i want to know as much as i can, i've looked this up and no results can someone help?

I found a couple of references on here searching for 'text bubble'. A number of them make use of a gui and guitext. here's a link to you can use:

http://answers.unity3d.com/search?q=text+bubble

You'll also need this:

http://unity3d.com/support/documentation/Components/GUI%20Scripting%20Guide.html

Thanks, Ares

If you're only interested in moving the jaw up and down, it can be done by finding the jaw bone in your character's skeleton, and setting the rotation of that object in LateUpdate() (I think, to override the animation).

Character bones appear as common parented transforms within Unity, and can be easily modified with scripts.

But there's more to a believable talking character than a moving jaw. :)