As far as i know the way water torture works is that the nerves in the area where the water hits basically go amok after a while, so that the victim feels extreme pain. An added bonus is that there is no physical marks afterwards. I must admit that i prefer disembowelling though...
Here is some more info on torture:
http://www.theelectricchair.com/torture.htm
http://www.angelfire.com/md/gina/page8.html
Okay, here's a funny/dumb thread for you, Cypress...
Strap a person down into a chair and force them to watch every recorded concert and movie of Barbara Striesand. 
If that doesn't work, we can switch to Bob Sagat clips and songs performed by William Shatner. 
If that doesn't work, we can switch to Bob Sagat clips and songs performed by William Shatner. "I don't know why, but watching 12-year old Japanese girls flinging their school uniforms at each other was wildly entertaining." - Azrael, Japanese Exchange Teacher.