This page contains the full size version of the animated "oobleck.gif" The animation may be slow on some computers. If this is the case then click on the image with the left mouse button and select "Save Image As..". You will then be able to view the animated image at full speed (hopefully).
Try to use a graphics package or gif viewer (such as Animagic) to see at full speed. Netscape does slow the process down.
To download Animagic or other viewer go to the Tucows site. Link from my Mixed bag page.