My old brain had some serious difficulties, but after a great deal of experimenting, I figured out how to do this (I think you just click on the image to start it up):
I'd like to figure out how to make my cat more animated - that's my next project! And if my computer had a microphone (d'oh!), I could have used my own voice instead of typing out Little Kitty's messages.
Definitely go check out the projects on Scratch - kids are having a good ol' time designing games, animation, and more.