"Waterboarding is a form of torture that consists of immobilizing the victim on his or her back with the head inclined downwards, and then pouring water over the face and into the breathing passages, causing the captive to believe he or she is dying. Forced suffocation and water inhalation cause the subject to experience the sensation of drowning."
Sounds like fun.
"Waterboarding is considered a form of torture by legal experts, politicians, war veterans, medical experts in the treatment of torture victims, intelligence officials, military judges and human rights organizations,"
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Incidentaly, a similar technique was used during the Spanish Inquisition.