This animation may take a moment to load. During that time you may see nothing, then a Java "coffee cup" image, some various rectangles on the screen, and then a progress bar ...
Once the Scratch project has completely loaded you'll see five cats.
This animation starts automatically,
with two messages from the middle cat
Click the green flag to restart the animation
To stop the animation click the red "stop sign".
To interact with the animation click the center cat,
or click anywhere and drag keeping the mouse down