Waterboarding is a torture technique which the USA have repeatedly been accused of using. It is widely accepted as being real torture, though some people still seem to doubt that. One forum poster called Scylla decided to debate this a bit more thoroughly and tested waterboarding on himself.
The resulting report is both exciting and creepy.
It’s torture. No question. Terrible terrible torture. To experience it and understand it and then do it to another human being is to leave the realm of sanity and humanity forever. No question in my mind.
(This article is also available in German)