Strange terminal behavior after quitting Tkinter application

[Chris]

> What happens if you type 'stty sane' (and of course, a carriage
> return) afterwards?

The terminal returns to normal, thanks!

But does anyone know why the Tkinter program is doing this to the
terminal in the first place? I don't want to have to tell users of my
program that they must recover their terminal's sanity each time after
running my program.