That's a question plenty of people have asked and there's no clear answer to yet. There are two theories though 1) It's like any other shiver (when you're cold) because you expel a warm liquid thus your body tries to rewarm from the loss, and 2) It's a reactions of the Autonomic Nervour System (because when you need to urinate and hold it in, your ANS sends signals to hold it even though there's bladder contractions - so the change from hold to release from the ANS causes the shudder.
-------------------- "Sometimes the majority only means that all the fools are on the same side" ~Anon Posts: 3429 | From: Pennsylvania | Registered: Jan 2008
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