Here are two tricks that will make Dashboard do some really interesting things.
Slow Motion
You can make Dashboard appear in slow motion by pressing the Shift key when you launch Dashboard.  For example, press Shift and F12 (default hot key) and watch the Widgets appear.  Repeat the step to make them disappear in slow motion.

Refresh a Widget
Simultaneously press the Command key and R to perform a refresh.  Watch as the Widget performs a twisting action.
Created: 9:47 PM on Jan 3, 2007
By: switchtoamac