Waterboarding. I did not know how it works exactly.
Just knew that there was water involved and that it induces the sympoms of 
drowning.
Here is a video of a self-experiment. Thanks to DaddyD for this link.

Ah, yes: Result of the experiment: Yes, it is torture.

     fra

link:
http://www.youtube.com/watch?v=qUkj9pjx3H0

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