So much for the fun of a spinning shield! Apprently spinning occurs when a character is wielding a shield and a wand/rod/etc, except Warrior for some reason... don't know about Ranger. I've only tried female characters. No idea whether the same occurs with male chars.
Here's a video of what I am talking about.
You would notice the spinning at the beginning of the video. The video itself is kinda choppy. :/
Spinning Shields
wolver1ne