This is like an urban myth and a classic prank, but I never saw it in action.
Supposedly if someone is passed out or sleeping, the contact with water will make him pee. Is this true? If true, why does this happen?
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OK, I'm gonna try a few links on you, not sure how "approved" they will be:
From The Straight Dope
Wry extract from a pretty useless forum thread on The Naked Science Foundation:
Wikipedia says (but the cite is a dead link):