If you hold down the shift button while clicking any of the main buttons in the system preferences pane (Display, Network, etc..) it will slow the animation down, just like in the expose slowed animation hint and the mail thread and application minimize and maximize hint.
[robg adds: This search will show you all our slow motion hints :)]
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Mac OS X Hints
http://hints.macworld.com/article.php?story=2003121916375710